21.18 Do you jog? Suppose that 10% of all adults jog. An opinion poll asks an SRS of 400 adults if they jog.(a) What is the sampling distribution of the proportion in the sample who jog?(b) According to the 68â95â99.7 rule, what is the probability that the sample proportion who jog will be 7.3% or greater?21.30 Averages versus individuals. Scores on the ACT college entrance examination vary Normally with mean Âµ = 18 and standard deviation ? = 6. The range of reported scores is 1 to 36.(a) What range contains the middle 95% of all individual scores?(b) If the ACT scores of 25 randomly selected students are averaged, what range contains the middle 95% of the averages ?