# 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 634502: If two percent of electric bulbs manufactured are defective,find the probability that in a sample of 200 bulbs less than 2 bulbs are defective. [Given: e to the power of -4 =0.0183,e to the power -2=0.114] Click here to see answer by stanbon(57352)

 Question 634563: A wireless garage door opener has a code determined by the up or down setting of 12 switches. How many outcomes are in the sample space of possible codes? Click here to see answer by Alan3354(30993)

 Question 634572: 9. The amount of liquid a paper towel can absorb will be use to marked the paper towel. Suppose a sample of 15 new towels average 12.5 grams with standard deviation of 1.15 grams. the previous version of this paper towel absorbed an average of 12 grams. Select the appropriate null and alternative hypothesis to see if new paper towel absorbs more, on average, than the previous one. Question 9 options: Ho: =12 and Ha: 12 Ho: 12 and Ha: > 12 Ho: 12 and Ha: < 12 Ho: 12 and Ha: > 12 Click here to see answer by stanbon(57352)

 Question 634577: 21. A soft-drink manufacturer claims that its 12-ounce cans do not contain, on average, more than 30 calories. A random sample of 16 cans of this soft drink, which were checked for calories, contained a mean of 31.8 calories with a standard deviation of 3 calories. Assume that the number of calories in 12-ounce soda cans is normally distributed. State the null and alternative hypotheses to test the manufacturer claim. Question 21 options: Ho: 31.8 and Ha: > 31.8 Ho: 30 and Ha: > 30 Ho: 30 and Ha: > 30 Ho: 31.8 and Ha: > 31.8 Click here to see answer by stanbon(57352)

 Question 634576: 15. Some financial theoreticians believe that the stock market's daily prices constitute a "random walk with positive drift." If this is accurate, then the Dow Jones Industrial Average should show a gain on more than 50% of all trading days. The average increased on 101 of 175 randomly chosen days. If = 5%, what do you think about the suggested theory? Question 15 options: Since the critical Z value is 1.645, we are going to reject the null hypothesis. At =5%, the data does not provide significant support for the theory. Since the critical Z value is 1.645, we are going to reject the null hypothesis. At =5%, the data does provide significant support for the theory. Since the critical Z value is 1.645, we are going to fail to reject the null hypothesis. At =5%, the data does not provide significant support for the theory. Since the critical t value is 2.364, we are going to reject the null hypothesis. At =5%, the data does not provide significant support for the theory. Click here to see answer by stanbon(57352)

 Question 634591: A cage has 10 male and 5 female birds. If three birds are selected at random from the cage , what is the probability that all are males? Click here to see answer by stanbon(57352)

 Question 634590: The probability that a man will live 10 more years is 1/4, and the probability that his wife will live more years is 1/3. Find the probability that a. both will be alive in ten years; b. at least one will be alive in 10 years; c. neither will be alive in 10 years; d. only the wife will be alive in 10 years; Click here to see answer by stanbon(57352)

 Question 634599: If we randomly select 2 diskettes, one after the other , from a box containing a diskettes of which 3 are unformatted, a. What is the probability that both of them will be unformatted? b. What is the probability that both of them will be formatted? Click here to see answer by ewatrrr(10682)

 Question 634600: Three balls are drawn without replacement from a box containing 4 red and 2 white balls. What is the probability that, out of three balls drawn, 2 are red? Click here to see answer by ewatrrr(10682)

 Question 634598: The National Health Center of health Statistics reported that for every 800 deaths in recent years, 30 resulted from car accident, 180 from cancer, and 300 from heart disease. a. Find the probability that a particular death is due to car accident. b. Find the probability that a particular death is either due to cancer or from heart disease. Click here to see answer by ewatrrr(10682)

 Question 634574: 13. Some financial theoreticians believe that the stock market's daily prices constitute a "random walk with positive drift." If this is accurate, then the Dow Jones Industrial Average should show a gain on more than 50% of all trading days. The average increased on 101 of 175 randomly chosen days. State the null and alternative hypothesis to verify the theory. Question 13 options: Ho:P 0.5 and Ha: P > 0.50 Ho: 101 and Ha: > 101 Ho:P 0.5 and Ha: P < 0.50 Ho: 101 and Ha: < 101 Click here to see answer by ewatrrr(10682)

 Question 634636: From a group of 6 men and 8 women, 5 people are chosen at random. Find the probability that there are more men chosen than women? Click here to see answer by ewatrrr(10682)

 Question 634635: From a group of 6 men and 8 women, 5 people are chosen at random. Find the probability that there are more men chosen than women? Click here to see answer by ewatrrr(10682)

 Question 634632: Find the z-scores for which 90% of the distribution's area lies between -z and z. Click here to see answer by ewatrrr(10682)

 Question 634703: If A and B are independent events, P(A) = 0.3, and P(B) = 0.55, find the probabilities below. (a) P(A ⋂ B) (b) P(A ⋃ B) Click here to see answer by Edwin McCravy(8909)

 Question 634702: Determine if this statistical study is descriptive or inferential: A study finds that the median household income in the US has declined over the last two years. Click here to see answer by jim_thompson5910(28595)

 Question 634695: Two cards are selected at random without replacement from a well-shuffled deck of 52 playing cards. Find the probability that two cards of the same suit are drawn. (Round your answer to four decimal places.) Click here to see answer by Edwin McCravy(8909)

 Question 634736: hat is th rejection region of a two-tailed test conducted with a null hypothesis of 55% and a significance level of 0.05 Click here to see answer by stanbon(57352)

 Question 634701: Determine if this is an example of a variable or a parameter: 18.3% of women have a history of breast cancer in their family Click here to see answer by stanbon(57352)

 Question 634694: Determine if this data is qualitative or quantitative: Major field of study Click here to see answer by stanbon(57352)

 Question 634685: Suppose I want to estimate the proportion of Americans who watch TV. So I collected a random sample of 100 Americans and proportion for my sample was 0.42. Find the 95% CI. Click here to see answer by stanbon(57352)

 Question 634747: A set of 50 data values has a mean of 45 and a variance of 9. I. Find the standard score (z) for a data value = 52. II. Find the probability of a data value < 52. Click here to see answer by stanbon(57352)

 Question 634810: How many different ways can a visiting nurse see seven patients if she sees them all in one day/ Click here to see answer by ewatrrr(10682)

 Question 634815: How many different 4-digit numbers can be formed from the digits 2, 3,4,5,6,7, and 8 if: a. Repetition of digits is not allowed? b. Repetition of digits is allowed? c.How many of them are odd numbers? Refer to letter a. d. How many of them are even numbers? Refer to letter b. Click here to see answer by ewatrrr(10682)

 Question 634819: How many different codes can be made using letters of the word BEAUTY if each code must contain 3 letters? Click here to see answer by ewatrrr(10682)

 Question 634821: An inspector must select three tests to perform in a certain order on a manufactured part.He has a choice of seven tests. How many ways can he perform three different tests? Click here to see answer by ewatrrr(10682)

 Question 634817: In how many ways can 12 different cars be displayed along the circumference of a parking area? Click here to see answer by ewatrrr(10682)

 Question 634809: How many different signals using three distinct flags can be made if there are five different flags from which to select? Click here to see answer by ewatrrr(10682)

 Question 634827: r the standard normal curve, find the z-score that corresponds to the 90th percentile? Click here to see answer by ewatrrr(10682)

 Question 634832: Find the z-scores for which 90% of the distribution's area lies between -z and z. Click here to see answer by ewatrrr(10682)

 Question 634831: Find the area under the standard normal curve between z = 0 and z = 3 Click here to see answer by ewatrrr(10682)

 Question 634829: IQ test scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the x-score that corresponds to a z-score of -1.645 Click here to see answer by ewatrrr(10682)

 Question 634822: In order to survey the opinions of costumers at shopping malls a researcher decides to select 5 malls from a total of 9 malls in a specific geographic area. How many different ways can the selection be made? Click here to see answer by ewatrrr(10682)

 Question 634807: In a board of directors composed of nine people, how many ways can a chief executive officer, a director, and a treasurer be selected? Click here to see answer by ewatrrr(10682)

 Question 634835: A girl has 7 coins of different denominations. How many different sums of money can she form using 2 coins at a time? Click here to see answer by ewatrrr(10682)
 Question 634835: A girl has 7 coins of different denominations. How many different sums of money can she form using 2 coins at a time? Click here to see answer by richwmiller(9143)

 Question 634869: Suppose that a certain college class contains 62 students. Of these, 34 are sophomores, 35 are psychology majors, and 7 are neither. A student is selected at random from the class. a) What is the probability that the student is both a sophomore and a psychology major? (b) Given that the student selected is a sophomore, what is the probability that he is also a psychology major? Click here to see answer by ewatrrr(10682)

 Question 634787: If we randomly select 2 diskettes, one after the other , from a box containing a diskettes of which 3 are unformatted, a. What is the probability that both of them will be unformatted? b. What is the probability that both of them will be formatted? Click here to see answer by ewatrrr(10682)

 Question 634907: Please answer the following questions regarding the graph below: What percentage of the grand total of students are females in the BSN program? How would you interpret the relationship between gender and majors in this graph? List the percentages of students in each major area as compared to the grand total. Graph shows: females males Lang Arts 7 4 BACH 8 5 BSN 9 4 CJ 5 8 Click here to see answer by ewatrrr(10682)