The amounts a soft drink machine is designed to dispense for each drink are normally distributed, with a mean of 12 fluid ounces and a standard deviation of 0.3 fluid ounce. A drink is randomly selected. (a) Find the probability that the drink is less than 11.8fluid ounces. (b) Find the probability that the drink is between […]
The mean incubation time for a type of fertilized egg kept at 100.4°F is 23days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 2days. (a) What is the probability that a randomly selected fertilized egg hatches in less than 19 days? (b) What is the probability that a randomly selected […]
Use the normal distribution of SAT critical reading scores for which the mean is 500and the standard deviation is 113. Assume the variable x is normally distributed. (A) What percent of the SAT verbal scores are less than 550? (B) If 1000 SAT verbal scores are randomly selected, about how many would you expect to be greater […]
17. 55% of all small businesses in the United States have a website. You randomly select 12 small businesses. Let x be a binomial random variable denoting the number of small businesses out of 12 that have a website. a. Find n and p b. Find the mean and standard deviation for the number of businesses […]
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