Answer Happy

In a recent study reported Oct. 29, 2012 on the Flurry Analytics Blog website (flurry.com/blog), the mean age of tablet users is 33 years. Suppose the standard deviation is 10 years. Take a sample of size n = 144. Check off the following that are true. At least one must be true. Complete the following table for the distribution of X and X. Round the standard deviation of X (standard error of the mean) to four decimal places as needed. X 1 On ≥ 30 OX is normally distributed P75 Sample size Mean Standard deviation Distribution B 33 10 Unknown a. Find the probability that the sample mean age is more than 30 years (the reported mean age of tablet users in this particular study). 31.34 32.17 33 X Round your answer to four decimal places 31.34 32.17 Select an answer P(X ≥ 30) b. Find the 75th percentile for the sample mean age (to one decimal place). X I 33.83 34.66 354 33 133.83 34.66 & years. (Round your answer to one decimal place) 354