The mean value of land and buildings per acre from a sample of farms is $1400, with a standard deviation of $200. The data set has a bell-shaped distribution. Assume the number of farms in the sample is 79. (a) Use the empirical rule to estimate the number of farms whose land and building values per acre are […]
22% of college students say they use credit cards because of the rewards program. You randomly select 10 college students and ask each to name the reason he or she uses credit cards. Find the probability that the number of college students who say they use credit cards because of the rewards program is (a) exactly two, […]
The mean incubation time for a type of fertilized egg kept at 100.3°F is 20 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 2 days days. (a) What is the probability that a randomly selected fertilized egg hatches in less than 18 days? (b) What is the probability […]
Use the normal distribution of SAT critical reading scores for which the mean is 513 and the standard deviation is 120. Assume the variable x is normally distributed. (a) What percent of the SAT verbal scores are less than 650? (b) If 1000 SAT verbal scores are randomly selected, about how many would you expect to […]
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