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# Recent problems solved by 'ewatrrr'

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 Probability-and-statistics/647388: 1. A psychologist studied self-esteem scores and found the sample data set to be normally distributed with a mean of 50 and a standard deviation of 5. What is the median of this distribution? Answer a 45 b 55 c 50 d 5 e Cannot be determined from the information given 2.In a negatively skewed distribution, Alisha scored the mean, Ken scored the median, and Catherine scored the mode. Who had the highest score? Answer a Alisha b Ken c Catherine d All three scored approximately the same 3.In a normal distribution, Alisha scored the mean, Ken scored the median, and Catherine scored the mode. Who had the lowest score? Answer a Alisha b Ken c Catherine d All three scored approximately the same 4.The standard normal distribution has a mean of ___ and a variance of ____ Answer a 0; 0 b 1; 1 c 1; 0 d 0; 1 c 100; 15 5.A student scored 76 points on a quiz, and the student’s standard score was +2. The standard deviation of quiz scores was 10. What was the mean of the quiz scores? Answer a 56 b 64 c 88 d 96 e more than one answer is correct. 6.The standard deviation for the sample consisting of 6, 8, and 10 is Answer a 12.00 b -0.67 c 1.00 d 1.63 e 2.00 7.A medical association randomly selected 10 trauma surgeons and 10 medical researchers and asked them how flexible their schedule is on a 1 (not at all flexible) to 9 (very flexible) scale. The data are summarized below: Trauma surgeons mean 2 variance 1 Medical researchers mean 7 variance 3 Select the statement that accurately reflects these results: Answer a. All medical professionals have similar levels of flexibility in their schedules. b. Trauma surgeons have more flexibility than medical researchers. c. Medical researchers agree more with each other about their level of flexibility than trauma surgeons. d. Trauma surgeons agree more with each other about their level of flexibility than medical researchers. c. none of the above 8. A sample of data has a standard deviation of 10. If you were to multiply all of the scores in the data set by factor of nine (9), what would the new standard deviation be? Answer a 5 b 10 c 30 d 90 e 10 9. Select the statement that is false. Answer a. Given a raw score, its z-score is the number of standard deviations above or below the mean. b. The variance for a set of data can be a negative value. c. A normal curve with mean 0 and standard deviation 10 has a greater spread of scores than a normal curve with mean 0 and standard deviation 1. d. The standard deviation for a set of data 10. Along with the mean, which of the following completely characterizes a standard normal distribution? Answer a Mode b Skew c Variance d Symmetry e Median 1 solutions Answer 406159 by ewatrrr(10682)   on 2012-09-07 13:24:03 (Show Source): You can put this solution on YOUR website!``` Hi,will quickly help with several... For a perfect normal distribution, the mean, median and mode are all equal. 1. C and 3. D 4. D (m = 0 and SD = 1, variance = SD^2 5. 2 = 76-m/10, m = 56 6. m=8, variance = 8/2 = 4, SD = sqrt(4) = 2 10. variance ```
 Matrices-and-determiminant/647382: Which of the following represents a way to solve the system for x using Cramer's rule? 2x – y = 4 –5x + 3y = 31 solutions Answer 406158 by ewatrrr(10682)   on 2012-09-07 13:05:45 (Show Source): You can put this solution on YOUR website! ``` Hi, Cramer's rule: 2x – y = 4 –5x + 3y = 3 x = Dx/D = 15/1 = 15 and y = Dy/D = 26/1 = 26 Note: = = 1 = 15 = 26 ```
 Probability-and-statistics/647344: Please help. Suppose that you select 2 cards without replacement from a deck. A. If the first card that you select is a king, what is the probability that the second card you select is a spade? Any help would be greatly appreciated!1 solutions Answer 406154 by ewatrrr(10682)   on 2012-09-07 12:48:39 (Show Source): You can put this solution on YOUR website! ``` Hi, Suppose that you select 2 cards without replacement from a deck. A. If the first card that you select is a king, what is the probability that the second card you select is a spade? Might consider using: P(A|B) = P(A and B)/P(B) where P(A and B) = P(2nd is a spade|1st is a K) = ```
 Geometry_Word_Problems/647379: Robert wants to fence in his backyard that is 28 feet by 26 feet. How much fencing does he need? 1 solutions Answer 406153 by ewatrrr(10682)   on 2012-09-07 12:33:51 (Show Source): You can put this solution on YOUR website! ``` Hi, Robert wants to fence in his backyard that is 28 feet by 26 feet of fencing ```
 Length-and-distance/647348: if each side of a regular solid is 5 centimeters long what is the volume of the solid?1 solutions Answer 406151 by ewatrrr(10682)   on 2012-09-07 12:29:47 (Show Source): You can put this solution on YOUR website! ``` Hi, each side of a regular solid is 5 centimeters long ```
 Probability-and-statistics/647371: In how many ways can the countries be assigned so that there is at least one North American that is not assigned and at least one South American country that is not assigned? Suppose that there are total of 16 students in a class. The teacher assigns each student a country for a report. 9 North American and 13 South American can be assigned. Assuming that the order doesn't matter: 1 solutions Answer 406150 by ewatrrr(10682)   on 2012-09-07 12:26:58 (Show Source): You can put this solution on YOUR website! ``` Hi, Might consider the possibilities of only using 8NA and 12SA For ex: + + + + ```
 Numbers_Word_Problems/647370: problem# 1 Can you guess my number? The number is less than 30. The sum of the digits is 10. The number is an even number. What number am I? 1 solutions Answer 406149 by ewatrrr(10682)   on 2012-09-07 12:15:58 (Show Source): You can put this solution on YOUR website! ``` Hi, Key is The number is less than 30 and EVEN (can't be 19) Even...having digits that would add to 10... could only be 28 ```
 absolute-value/647364: Hi, I'm in a hybrid math class at my college, so i don't get to see my teacher for another week and i have no idea how to do this problem. Can you please help me? I don't understand the "K" rule: K={K if K>(or equal to)0 {-K if K< 0 I have an example from my book here: (I am just having a hard time with this because my book does not explain anything.) absol. (x-2)^2 absol. I thought you would do this: (x-2)(x-2) and multiply: x^2+4 The answer in the book says (x-2)^2 is the answer along with: absol.K absol.=K if K> (or equal to) 0 I dont understand how to find out what K rule to use if there is no real number value. Thank you, Sydney1 solutions Answer 406148 by ewatrrr(10682)   on 2012-09-07 12:10:25 (Show Source): You can put this solution on YOUR website!``` Hi, the idea is by definition: absolute value |number| ALWAYS has an 'absolutely' ≥ 0 result regardless if the number is positive or negative for ex: |4| = 4 and |-4| = 4 As to: |K| = K, that would only be true if K itself were ≥ 0 |(x-2)^2| = (x-2)^2 | quanity (x-2) 'squared' is ALWAYS ≥ 0 ```
 Problems-with-consecutive-odd-even-integers/647360: Three good friends are in the same Algebra class. Their scores are three consecutive numbers whose sums equal to 252. Find each score.1 solutions Answer 406144 by ewatrrr(10682)   on 2012-09-07 11:47:08 (Show Source): You can put this solution on YOUR website! ``` Hi, scores are three consecutive numbers whose sums equal to 252. Note: Scores are: 83, 84, 85 ```
 Volume/647341: A cylindrical object has a diameter of 1.25cm and a height of 6.48cm. What is its volume?1 solutions Answer 406136 by ewatrrr(10682)   on 2012-09-07 10:20:37 (Show Source): You can put this solution on YOUR website! ``` Hi, A cylindrical object has a diameter of 1.25cm ( r = .625cm) and a height of 6.48cm ```
 Geometry_Word_Problems/647337: The area of the floor of the rectangular room shown in the figure is 126 square feet. The length of the room is 1 ˝ feet longer than the width. Find the length of the room. 1 solutions Answer 406134 by ewatrrr(10682)   on 2012-09-07 10:06:57 (Show Source): You can put this solution on YOUR website! ``` Hi, The length of the room is 1 ˝ feet longer than the width. Find the length of the room. Question states*** A = 126ft^2 | L = W^2 + 1.5W - 126 = 0 W = 10.5ft (Throwing out the negative solution for unit measure) L = 12ft and.. ```
 Problems-with-consecutive-odd-even-integers/647338: if n is the sum of two consecutive odd integers and less than 100 , what is the greatest probabillity if n ? 1 solutions Answer 406133 by ewatrrr(10682)   on 2012-09-07 09:59:43 (Show Source): You can put this solution on YOUR website! ``` Hi, n is the sum of two consecutive odd integersand and is less than 100 Question states*** x + x-2 <100 x < 49 Biggest two consecutive odd integers possible is 47,49 47+ 49= 96, their sum 96 is the greatest probability of n. ```
 Geometry_Word_Problems/647335: The Ortegas have an apple orchard that contains 150 trees. The number of trees in each row is 20 more than twice the number of rows. Find the number of rows and the number of trees per row. 1 solutions Answer 406132 by ewatrrr(10682)   on 2012-09-07 09:51:26 (Show Source): You can put this solution on YOUR website! ``` Hi, The number of trees in each row is 20 more than twice the number of rows. Question states***orchard that contains 150 trees. | y = 2x^2 + 20x - 150 = 0 x^2 + 10x - 75 = 0 (x+15)(x-5) = 0 x = 5, throwing out the negative solution for number of rows x(rows) = 5 and y(trees in @ row) = 30 ```
 Sequences-and-series/647305: the sum of the first fifteen terms of an arithmetic terms progression is 270. find the first term and the common difference if the the fifteenth terms is 39.1 solutions Answer 406131 by ewatrrr(10682)   on 2012-09-07 09:43:59 (Show Source): You can put this solution on YOUR website! ``` Hi, the sum of the first fifteen terms of an arithmetic terms progression is 270. find the first term and the common difference if the the fifteenth terms is 39 ⇒ , = -3 ⇒ ⇒ d = 3 and ```
 Linear-equations/647332: 1/3(m-6) + 1/2(m+5)=5/31 solutions Answer 406129 by ewatrrr(10682)   on 2012-09-07 09:34:35 (Show Source): You can put this solution on YOUR website! ``` Hi, |Multiplying thru by 6 so as all denominators = 1 2(m-6) + 3(m+5) = 10 will Let You take it from here ```
 test/647306: http://m1146.photobucket.com/albumview/a… Please help with number 88. I'm confused on how I should deal with the negative exponent. I know I have to switch it and put a 1 over but then the whole problem just became very, very confusing. I got 20x and I think the answer is wrong. Thank you for your help. 1 solutions Answer 406126 by ewatrrr(10682)   on 2012-09-07 09:03:11 (Show Source): You can put this solution on YOUR website!Previously Posted
 Equations/647312: translate the phrase to an algebraic expression, state what each variable represents. one sixth of a number plus one fifth of a different number. The answer__. x is the first number y is the second number. do not factor 1 solutions Answer 406124 by ewatrrr(10682)   on 2012-09-07 09:02:31 (Show Source): You can put this solution on YOUR website! ``` Hi, one sixth of a number plus one fifth of a different number. Write as We Read ```
 Radicals/647288: What is the answer to this question: Simplify the square root of 12 plus the square root of 20? A:4 times the square root of 2 B:4(square root of 3 plus square root of 5) C:8 times square root of 2 D:2 times square root of 3 + 2 times square root of 5. E:None of these. S.O.S HELP!!!!1 solutions Answer 406121 by ewatrrr(10682)   on 2012-09-07 08:52:43 (Show Source): You can put this solution on YOUR website! ``` Hi, simplify (putting in terms of the smallest square root possible) ```
 Age_Word_Problems/647286: Cam is seven, Adam is 8 years older than Steven, and Steven is four years older than Cam. How old is Steven?1 solutions Answer 406118 by ewatrrr(10682)   on 2012-09-07 08:48:44 (Show Source): You can put this solution on YOUR website! ``` Hi, Cam is seven,and Steven is four years older than Cam. How old is Steven? ```
 test/647294: Find the leas common multiple(LCM)of the following numbers 27,45,153. I came up with 2295. Is that correct? 1 solutions Answer 406116 by ewatrrr(10682)   on 2012-09-07 08:44:36 (Show Source): You can put this solution on YOUR website! ``` Hi, factoring each out...Yes! 2295. Good Work 27 3 3 3 45 3 3 5 153 3 3 17 LCM ```
 Miscellaneous_Word_Problems/647289: Mitsuko’s salary for next year is \$44,940. This represents a 7% increase over this year’s salary. Find Mitsuko’s present salary. Can someone help please? I know the answer is \$42,000 but I cant figure out how this was done? I tried by subtracting 100%-7% which I get .93, then I multiplied it by 44,940 thinking I would get 42,000 but I'm doing something wrong, what am I missing? thank you.1 solutions Answer 406112 by ewatrrr(10682)   on 2012-09-07 08:35:57 (Show Source): You can put this solution on YOUR website! ``` Hi, Mitsuko’s salary for next year is \$44,940. This represents a 7% increase over this year’s salary. Best to Set Up it Up Algebraicly... Question states*** P + .07P = 44940 P(1 + .07) = 44940 ```
 logarithm/647296: Select a logarithmic equation for the given exponential equation m=e^10x in (10x)=m in(x)=10m in(m)=10x in(10m)=x I answered (10m)=x is this right? Thank you 1 solutions Answer 406111 by ewatrrr(10682)   on 2012-09-07 08:29:07 (Show Source): You can put this solution on YOUR website! ``` Hi, If ```
 Equations/647321: how do i do the equation 2/3(m+6)=-1/2 1 solutions Answer 406109 by ewatrrr(10682)   on 2012-09-07 08:18:46 (Show Source): You can put this solution on YOUR website! ``` Hi, | Cross Multiplying to solve 4 = -3(m+6) 4 = -3m - 18 3m = -22 m = -22/3 ```
 Coordinate-system/647297: Choose a set of two ordered pairs that satisfy the equation and have the same x=coordinates but different y coordinates x^2=y^2 (7,7)(7,-7) (8,-9(9,9) (5,-6)(6,6) (1,-1)(1,5) My answer would be (1,-1)(1,5) but will that be correct? thank you1 solutions Answer 406108 by ewatrrr(10682)   on 2012-09-07 08:13:53 (Show Source): You can put this solution on YOUR website! ``` Hi, Choose a set of two ordered pairs that satisfy the equation and have the same x=coordinates but different y coordinates x^2=y^2 Two of the (x,y) choices qualify: (7,7)(7,-7)****** 7^2 = 7^2 and 7^2 = (-7)^2 (1,-1)(1,5) Note: 1^2 ≠ 5^2 ```
 logarithm/647299: If log[16]x+log[4]x+log[2]x=7, then x=??? 1 solutions Answer 406107 by ewatrrr(10682)   on 2012-09-07 08:09:13 (Show Source): You can put this solution on YOUR website! ``` Hi, log[16]x+log[4]x+log[2]x=7 Note: & |Multiplying thru by 28 so as all denominators = 1 ```
 Volume/647304: Calculate the capacity of a solution tank in litres. The diameter of the tank is 60 cm and the height is 1m. 1 solutions Answer 406105 by ewatrrr(10682)   on 2012-09-07 07:56:27 (Show Source): You can put this solution on YOUR website! ``` Hi, The diameter of the tank is 60 cm(radius = 30cm) and the height is 1m. ```
 test/647314: http://m1146.photobucket.com/albumview/a… Please help with number 88. I'm confused on how I should deal with the negative exponent. I know I have to switch it and put a 1 over but then the whole problem just became very, very confusing. I got 20x and I think the answer is wrong. Don't ask me how I got that, I probably skipped an important step or did something wrong. Thank you for your help.1 solutions Answer 406104 by ewatrrr(10682)   on 2012-09-07 07:51:06 (Show Source): You can put this solution on YOUR website!Previously Posted
 Exponents-negative-and-fractional/647315: http://m1146.photobucket.com/albumview/albums/pigrabbit_8/dfe0330c.jpg.html?o=0&newest=1 Please help with number 88. I'm confused on how I should deal with the negative exponent. I know I have to switch it and put a 1 over but then the whole problem just became very, very confusing. I got 20x and I think the answer is wrong. Don't ask me how I got that, I probably skipped an important step or did something wrong. Thank you for your help.1 solutions Answer 406103 by ewatrrr(10682)   on 2012-09-07 07:50:05 (Show Source): You can put this solution on YOUR website! ``` Hi, ⇒ ⇒ Note:5^(1/2)*5^(3/2) = 5^(1/2+3/2) & x^5/2/x^3/2 = x^(5/2-3/2) ```
 Geometry_Word_Problems/647311: Find the area and perimeter of a triangle whose sides are: A=15cm B=10cm C=5cm H=7cm My answer: A=1/2 bh A=10x5=50/2=251 solutions Answer 406102 by ewatrrr(10682)   on 2012-09-07 07:35:51 (Show Source): You can put this solution on YOUR website! ``` Hi, A=15cm B=10cm C=5cm H=7cm Perimeter = Area=cm^2 Assuming longest side is the base. ```
 Volume/647300: A childrens rectangular pool holds 480 cu ft of water . what is the debth of the pool if its length is 30 ft and its width is 16 ft v= l*w*d ? 480= 30 * 16 * d 480= 480* d 1= d am i right 1 solutions Answer 406101 by ewatrrr(10682)   on 2012-09-07 07:25:48 (Show Source): You can put this solution on YOUR website! ``` Hi, v= l*w*d Yes, good work! Important to submit your answer with the proper unit of measurement ```
 Geometry_Word_Problems/647310: Find the length of fencing needed to surround a rectangle corral the measuring 60 ft on each side. Here is my answer: A=LW 60x60=3600 ft1 solutions Answer 406100 by ewatrrr(10682)   on 2012-09-07 07:21:48 (Show Source): You can put this solution on YOUR website!``` Hi, Note: A = LW = is Area in ft^2 not length in ft. P(distance around) = 2L + 2W = ```