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Question 1138189: BlueSky Air has the best on-time arrival rate with 80% of its flights arriving on time . A test is conducted by randomly selecting 16 BlueSky Air flights and observing whether they arrive on time.
Finding the exact probability that at least 8 flights of BlueSky Air arrive late can be very tedious. As such we make use of Normal approximation model. What is the approximated probability? (Please carry answers to at least six decimal places in intermediate steps. Give your final answer to the nearest three decimal places).
Probability (as a proportion)
Click here to see answer by Boreal(15235)

Question 1138477: An HP laser printer is advertised to print text documents at a speed of 18 ppm (pages per minute). The manufacturer tells you that the printing speed is actually a Normal random variable with a mean of 17.57 ppm and a standard deviation of 3 ppm. Suppose that you draw a random sample of 11 printers.
Part i) Suppose the number of printers drawn is quadrupled. How will the standard deviation of sample mean printing speed change?
A. It will increase by a factor of 4.
B. It will decrease by a factor of 2.
C. It will increase by a factor of 2.
D. It will decrease by a factor of 4.
E. It will remain unchanged.
Part ii) Suppose the number of printers drawn is quadrupled. How will the mean of the sample mean printing speed change?
A. It will decrease by a factor of 4.
B. It will increase by a factor of 4.
C. It will decrease by a factor of 2.
D. It will increase by a factor of 2.
E. It will remain unchanged.
Part iii) Consider the statement: 'The distribution of the mean printing speed of the sampled printers is Normal.'
A. It is a correct statement, and it is a result of the Central Limit Theorem.
B. It is a correct statement, but it is not a result of the Central Limit Theorem.
C. It is an incorrect statement. The distribution of the mean printing speed of the sample is not Normal.
Click here to see answer by Boreal(15235)

Question 1138473: Holding everything else constant, which change to the sample size will reduce the width of a confidence interval for a population mean by half?
A. Quadruple the sample size.
B. Half the sample size.
C. Square the sample size.
D. Double the sample size.
E. Raise the sample size to the power 4.
Click here to see answer by Boreal(15235)

Question 1138562: On a map two cities are 5 1/2 inches apart.The map uses a scale of 2 inches = 75 miles.

What is actual distance between two cities?
Click here to see answer by Theo(13342)

Question 1139770: It takes 16 people to build 12 houses in 8 days
How many houses can be built by 8 people in 4 days
Click here to see answer by ikleyn(52781)

Question 1139943: The weight of an object on a planet is directly proportional to the weight of the object on Earth. A 7 pound object on Earth weighs 94 pounds on this planet. Express the weight of an object on this planet, y, as a function of the weight of the object on Earth, x. Round the k value to 3 decimal places.
Click here to see answer by Alan3354(69443)

Question 1141015: the ratio of slaked lime to sand in mortar is 2 to 5. how much sand is mixed with 17 bags of slaked lime in a supply of this mortar

Click here to see answer by josgarithmetic(39617)

Question 1141015: the ratio of slaked lime to sand in mortar is 2 to 5. how much sand is mixed with 17 bags of slaked lime in a supply of this mortar

Click here to see answer by ikleyn(52781)

Question 1141597: Need help with this word problem, please, for my 7th grader.
Carrie scored 10 points for every eight points that Alan scored. If the two scored a total of 90 points, how many points did each person score?
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Question 1141857: A certain shade of green is formed by mixing 3 parts blue to 2 parts yellow. How many ounces of yellow are needed to make 37 ounces of this green?
Click here to see answer by ikleyn(52781)

Question 1141855: A school has a ratio of men to women of 4:9 if there are 728 students at the school, how many are men?
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Question 1141864: A car used 34 gallons of gas to travel 825 miles. At that rate what amount of gas is needed to travel 2425 miles?
Click here to see answer by josgarithmetic(39617)

Question 1141864: A car used 34 gallons of gas to travel 825 miles. At that rate what amount of gas is needed to travel 2425 miles?
Click here to see answer by ikleyn(52781)

Question 1141863: A man loses 13 pounds in 4 months. At this rate, how many pounds will he lose in 18 months?
Click here to see answer by josgarithmetic(39617)

Question 1141940: An ordinary Fair die is a cube with the numbers 1 through 6 on the sides represented by painted spots. Imagine that such a die is rolled twice in succession and that the face values of the two roles are added together. The sum is recorded as the outcome of a single trial of a random experiment compute the probability of each of the following events event a the sum is greater than 7 event be the sum is an even number write your answers as exact fractions
Click here to see answer by ikleyn(52781)

Question 1141970: A car travels at a speed of (3x +1)kph. What is the distance covered by the car in (x+2) hrs?
Click here to see answer by Alan3354(69443)

Question 1142304: If I can buy a 12 pack of seltzer for $11 and I have $46 on me, how many packs of seltzer can I buy?
My work: I made this a proportion: 12/$11 = x/$46 is this proportion accurate? When I did that I made another proportio: 11x/11 = 552/11. This gave me about 50 packs of seltzer. Is this right?
Click here to see answer by ikleyn(52781)

Question 1142353: Find the solution to the equations.
2x - y = -3
x + y = 0
(0, 0)
(-1, 1)
(1, -1)
Click here to see answer by math_helper(2461)

Question 1142665: Three parts of liquid chlorine and two parts of salt are added to each 100 parts of water in a swimming pool. How much chlorine is required if the pool contains 4000 L (including chemicals)?

Click here to see answer by josmiceli(19441)

Question 1142891: A dish company needs to ship an order of 117 glass bowls. The company will put the bowls into several boxes. Each box must contain the same number of bowls. How many boxes could the company use for the order?

Click here to see answer by josmiceli(19441)

Question 1142890: One trip around a running track is 440 yards. One jogger can complete one lap in 8 minutes, the other can complete it in 6 minutes. How long will it take for both joggers to arrive at their starting point together if they start at the same time and maintain their jogging pace?

Click here to see answer by josmiceli(19441)

Question 1143035: Chris is driving a truck that can hold 4 tons maximum.he has a shipment of food weighing 26 000 pounds.how many trips will need to make to deliver all of the food?
Click here to see answer by greenestamps(13200)

Question 1143325: 1. Calculate the class average for Unit 1. Using the “Grading Scale” listed below with the “Percentage Grade Total” above, what is the overall class average “Letter Grade”?
Grading Scale
Letter Grade Percentage Letter Grade Percentage
A 93 - 100 C+ 77 - 79.99
A- 90 - 92.99 C 73 - 76.99
B+ 87 - 89.99 C- 70 - 72.99
B 83 - 86.99 D+ 67 - 69.99
B- 80 - 82.99 D 60 - 66.99
Class Average Letter Grade
Unit 1 ? ?

Click here to see answer by Alan3354(69443)

Question 1143381: The ratio of men to women working for a company is to 2 to 3. If there are 105 employees total, how many women work for the company?
Click here to see answer by josmiceli(19441)

Question 1143498: Find the number of gallons of sulfuric acid in 50 gallons of solution in a tank, if the percent of sulfuric acid is 50%
Click here to see answer by ikleyn(52781)

Question 1143633: 83 1/3 is how many sixteenths
Click here to see answer by josgarithmetic(39617)

Question 1143917: Jim buys 10 oranges and 15 mangoes. Mangoes are 20 cent cheaper than oranges. If the total costs $9.25, how much does each Mango and orange?

really need help???
Click here to see answer by MathLover1(20849)

Question 1144061: If it takes 6 men 4 days to dig a hole 3 metres deep, how long will it take for 10 men to dig a hole 7 metres deep?

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Question 1144061: If it takes 6 men 4 days to dig a hole 3 metres deep, how long will it take for 10 men to dig a hole 7 metres deep?

Click here to see answer by ikleyn(52781)

Question 1144677: The frequency in hertz (Hz) of a guitar wire varies directly as the square root of the tension and
inversely as the length. If a wire 500 mm long under 25 kg of tension vibrates at 256 Hz, what is
the frequency of a wire 450 mm long under a tension of 30 kg?
Click here to see answer by josgarithmetic(39617)

Question 1144680: The energy 𝑊 used by a device is directly related to the current 𝐼, the voltage 𝑉, and the length
of time 𝑡, for which the energy is used. How much energy will a 120-V light bulb use, which
draws a current of 1.25 in 8 h of use?
Click here to see answer by ikleyn(52781)

Question 1144681: The energy 𝑊 used by a device is directly related to the current 𝐼, the voltage 𝑉, and the length
of time 𝑡, for which the energy is used. If a 240-V clothes drier draws a current of 15 A and in 45
min uses 2.4 kWh (kilowatt hours) of energy, how much energy will a 120-V light bulb use, which
draws a current of 1.25 A in 8 h of use?
Click here to see answer by ikleyn(52781)

Question 1144682: A certain taper has a 0.516-in taper per foot. Find the amount of taper in a 5-in long taper if the
amount of taper varies directly with the length.
Click here to see answer by Alan3354(69443)

Question 1144699: Mr. Bins sold 1/2 of his farm to Mr. Frost and 100 acres to Mr. Slate. He now has 1/5 of his original farm land. How big was his farm originally? How much land does he have now?
Click here to see answer by ikleyn(52781)

Question 1144980: x:1/4%::8:12
what is the value of x?

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Question 1145238: a recipe calls for 3/4 cup of sugar . chayce wants to inscrease the recipe by 1 1/2 times how many cups of sugar should he use
Click here to see answer by Alan3354(69443)

Question 1146038: A, B, C, and D are four points on a line such that AB : AC = 7 : 10 , and BD : CD = 9 : 2. If CD = 9 cm, what is the length of AB?
Click here to see answer by greenestamps(13200)

Question 1146340: A baseball team has had 117 hits in 18 games. How many hits per game did the team hit?
Click here to see answer by Alan3354(69443)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265