# Questions on Algebra: Probability and statistics answered by real tutors!

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 Algebra: Probability and statistics Solvers Lessons Answers archive Quiz In Depth

 Question 375925: Assume that blood pressure readings are normally distributed with mean=120 and standard deviation =8. A blood pressure reading of 145 or more may require medical attention. What percentage of people have a blood pressure reading greater than 145? Click here to see answer by robertb(4012)

 Question 375884: A normal distribution consist of 100 scores with a mean of 65 and a standard deviation of 5. How many scores are above 70 and how many scores are below 55? Please break it down step by step, because I am not understanding. I think I got the 2nd half right, but I cannot come up with the 1st part with scores being above 70. Thanks Kerry Click here to see answer by stanbon(57290)

 Question 375905: The US senate of the 104th Congress consisted of 54 Republicans and 46 Democrats. How Many Committees can be formed if each committee must have 3 Republicans and 2 Democrats? Click here to see answer by Alan3354(30993)

 Question 375967: Suppose we have a set of blood pressures with a mean of 120 Systolic, and a sample standard deviation of 15 points. If we assume a normal distribution of Systolic blood pressures, then between what two values can we be assured 99.7% of all Systolic blood pressures will lie? Click here to see answer by robertb(4012)

 Question 375976: Find the probability of the event? Randomly guessing a 4- digit atm access code the probability is??? Click here to see answer by jim_thompson5910(28545)

 Question 375981: A dart is thrown randomly and stick on the circular dart board with 26 partitions. determine the probability that the dart lands on the area marked with a number greater than four and less than or equal to 13. Click here to see answer by edjones(7569)

 Question 375979: assume the probability is 1/2 that a child born is a girl if a family has three children. What is the probabilty of getting 1 girl is ___? the probability of getting at most two girls___? Click here to see answer by Fombitz(13828)

 Question 375904: Copykwwik has four photocopy machines A B C D The probability that a given machine will break down on a particular day is P(a)=1/50 P(B)= 1/60 P(C)= 1/75 P(D)= 1/40 assuming independence what is the probability on a particular day that a) all four machines will break down b) none of the machines will break down Click here to see answer by Fombitz(13828)

 Question 376017: USA Today reports that about 25% of all prison parolees become repeat offenders. Alice is a social worker whose job is to counsel people on parole. Let us say success means a person does not become a repeat offender. Alice has been given a group of four parolees. (a) Find the probability P(r) of r successes ranging from 0 to 4. (b) What is the expected number of parolees in Alice's group who will not be repeat offenders? What is the standard deviation? Click here to see answer by edjones(7569)

 Question 375961: in a online survey for talbots of 1095 women ages 35 yr and older the participants were asked what article of clothing women most want to fit perfectly a summary of the results of thesurvey follows article of clothing responedents jeans 470 black pantsuit 307 cocktail dress 230 white shirt 22 gown 11 other 55 if a women who participated in the survey is chosen at random what is the probabality that she most wants A) jeans to fit perfectly or b) a black paintsuit,or cocktail dress to fit perfectly Click here to see answer by edjones(7569)

 Question 375910: in a school,45% of the students are boys and 55% are girls. in this school, 12% of the boys are left handed and 9% of the girls are left handed. a student is to be chosen at random using a tree diagram a) calculate the probability that the student is not left handed Given that the student chosen is left handed, b)calculate, to 3 significant figures,the probabillity that the student is a girl Click here to see answer by edjones(7569)

 Question 375906: Elaine is 65 years old, and has the probability that she will be alive in 10 years is 76%. John is 35, and the probability that he will be alive in 10 years is 90%. What is the brobability they will be both alive in 10 years? Click here to see answer by edjones(7569)

 Question 376161: a bag contains 5 tennis balls and 4 cricket balls .three balls are drawn randomly from the bag.find probability that at least one of the drawn balls is a cricket ball Click here to see answer by robertb(4012)

 Question 376177: Two dice are rolled. What is the probability of getting a sum of at least 5? Click here to see answer by Edwin McCravy(8901)

 Question 376154: A number cube labeled with number 1,2,3,4,5 and 6 is tossed. what are the odds in favor of the cube showing an odd number?? When two balanced dice are rolled, there are 36 possible outcomes. What is the Probability that the sum of the numbers on the dice is 6 or 11? Click here to see answer by Fombitz(13828)

 Question 376113: What is the probability of two people selected at random having same age? (Not to be confused with same birthday problem). Click here to see answer by Fombitz(13828)

 Question 375965: SAT I scores around the nation tend to have a mean scale score around 500, a standard deviation of about 100 points, and are approximately normally distributed. What SAT I score within the population would have a percentile rank of approximately 97.5? Show all work as to how this is obtained. Click here to see answer by ewatrrr(10682)

 Question 376225: Describe the weight of the top 10% of the babies born with each gestation period. a. 37 to 39 weeks - mean birth weight=7.31lb, standard deviation=1.09lb b. 42 weeks and over - mean birth weight=7.61lb, standard deviation=1.11lb. Click here to see answer by ewatrrr(10682)

 Question 376263: Student Financial Aid In a recent year 8,073,000 male students and 10,980,000 female students were enrolled as undergraduates. Receiving aid were 60.6% of the male students and 65.2% of the female students. Of those receiving aid, 44.8% of the males got federal aid and 50.4% of the females got federal aid. Choose 1 student at random. (Hint: Make a tree diagram.) Find the probability that the student is a. A male student without aid b. A male student, given that the student has aid c. A female student or a student who receives federal Click here to see answer by ewatrrr(10682)

 Question 376280: Iq test scores are normally distributed with a mean of 100 and a standard deviation of 15. An individual's IQ score is found to be 110. Find the z-score corresponding to this value. Click here to see answer by Fombitz(13828)

 Question 376298: create the probability distribution for the following scenario by entering your answers as simplified fraction: the number of heads in 3 tosses of a coin Click here to see answer by Fombitz(13828)

 Question 375919: The distribution of cholesterol levels in teenage boys is approximately normal with the mean of 170 and Sd =30. Levels above 200 warrant attention. Find the probability that a teenage boy has a cholesterol level greater than 225. Click here to see answer by Fombitz(13828)

 Question 376302: probability: how many boys out of 4 newborns Click here to see answer by Fombitz(13828)

 Question 376308: The following time series data represent the yearly amounts spent on advertising (in millions of dollars) by a large toy company: 19.2, 20.7, 25.1, 23.9, 27.0, 23.9 This series of data begins in year 1997 (i.e., time period t=1 corresponds to 1997). Using regression analysis, a linear trend line of the form Tt=19.18+1.18t was fit to the data. Using this information, generate a forecast for the total yearly amount of money that will be spent on advertising in 2010 . Click here to see answer by user_dude2008(1861)

 Question 376309: There is a 10 question quiz. 8 of them are mutiple choice with 4 possible answeres. The other 2 are true false. How many ways are there to answer the test? Click here to see answer by user_dude2008(1861)

 Question 376315: The senate in a certain state is compromised of 54 republicans, 44 democrats, and 2 independents? How many commities can be formed if there has to be 5 republicans and 2 democrats? Click here to see answer by edjones(7569)

 Question 376288: Cable Television In 2006, 86% of U.S. households had cable TV. Choose 3 households at random. Find the probability that a. None of the 3 households had cable TV b. All 3 households had cable TV c. At least 1 of the 3 households had cable TV Click here to see answer by edjones(7569)

 Question 376318: if you draw 2 clubs on 2 consecutive draws from a standard deck of cards you win \$23 otherwise you pay me \$3 cards drawn without replacement enter the expected value of proposition Click here to see answer by edjones(7569)

 Question 376285: The probability that a given tourist goes to amusement park is 0.47, and the probability that she goes to the water park 0.58. if the probabitiy that she goes to either the water park or the amusement park is 0.95, what is the probability that she visit both of the parks on vacation Click here to see answer by edjones(7569)
 Question 376285: The probability that a given tourist goes to amusement park is 0.47, and the probability that she goes to the water park 0.58. if the probabitiy that she goes to either the water park or the amusement park is 0.95, what is the probability that she visit both of the parks on vacation Click here to see answer by robertb(4012)

 Question 376250: In an urn there are several color marbles, 8blue, 11white, 6yellow, 6red. You are to choose 5 marbles randomly. What is the probability that 4 or more are white marbles? (Please note step by step) Click here to see answer by edjones(7569)

 Question 376281: the lenghts of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days. A baby is premature if born 3 weeks early. What percentage of babies are born prematurely? Click here to see answer by robertb(4012)

 Question 376279: find the z score for which 90% of the distribution area lies between -z and z. Click here to see answer by robertb(4012)

 Question 376332: if you are dealt 5 cards from a deck of 52 cards, find the probability that all 5 cards are picture cards Click here to see answer by Edwin McCravy(8901)
 Question 376332: if you are dealt 5 cards from a deck of 52 cards, find the probability that all 5 cards are picture cards Click here to see answer by edjones(7569)

 Question 376335: 1. an ice chest contains 3 cans of apple juice, 5 cans of grape juice, 8 cans of orange juice and 2 cans of pineapple juice. You randomly select 3 cans succession. find the probability of selecting no grape juice? 2. the winner of a raffle will receive a new car. If 10,000 raffle tickets were sold and you purchased 25 tickets, what are the odds against your winning the car? 3. If you are given odds 3 to 7 in favor of winning a bet, what is the probability of winning the car? Click here to see answer by edjones(7569)

 Question 376352: you are dealt 1 card from 52 cards find probability that you are dealt a numbered card or a heart Click here to see answer by rfer(12657)

 Question 376351: if 10,000 raffle tickets were sold and you purchased 25 tickets what are the odds against your winning Click here to see answer by rfer(12657)

 Question 376420: Calculate the probability of getting a five card poker hand consisting of 3 kings and 2 queens. Click here to see answer by Fombitz(13828)

 Question 376507: * A lot of 75 washers contains five in which the variability in thickness around the circumference of the washer is unacceptable. A sample of 10 washers is selected at random, without replacement. i) What is the probability that at least one unacceptable washer is in the sample? ii) What is the probability that at most one unacceptable washer is in the sample? Click here to see answer by edjones(7569)

 Question 376519: * The probability of a successful assembly of a product in a manufacturing process is 0.8. i) What is the probability that the first successful assembly requires exactly four trials? ii) What is the probability that the first successful assembly requires at least four trials? iii) What is the probability that the first successful assembly requires at most four trials?iv) What assumptions did you make, if any, to solve this problem? Click here to see answer by Edwin McCravy(8901)

 Question 376696: an ice chest contains 3 cans of apple juice, 5 cans of grape, 8 cans of orange and 2 cans of pineapple what is the probability of selecting no grape Click here to see answer by jim_thompson5910(28545)

 Question 376701: if there are 8 red disks numbered 1 through 8, and 4 yellow disks numbered 9 through 12 find probability of selecting a disk numbered 3, given that a red disk is selected Click here to see answer by jim_thompson5910(28545)

 Question 376708: a mining company is considering two sites on which to dig, described as follows site A- profit if diamonds are found \$70 million. Loss if no diamonds are found \$25 million. probability of finding diamonds 0.2 site B- profit if diamonds are found \$110 million. loss if no diamonds are found \$16 million. probabilty of finding diamonds 0.1 What is the expected profit for each site? Click here to see answer by solver91311(16877)

 Question 376710: In a scientific study there are 12 guinea pigs, 8 of which are pregnant. If 3 are selected at rendom without replacement, find the probability that all are pregnant. Click here to see answer by robertb(4012)

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