Trackstudents were timed in the 100 yard dash. It was found that their times werenormally distributed with a mean of 15 seconds

Trackstudents were timed in the 100 yard dash. It was found that their times werenormally distributed with a mean of 15 seconds and a population standarddeviation of 2 seconds. Eighty percent of track students can complete the 100yard dash in less than what time?

Question 2

Thenumber of daily hits on the Excel Poweruser Workshop website is normallydistributed with a mean of 100,000 with a population standard deviation of10,000. What is the probability of getting more than 85,000 hits on a givenday?

Question 3

Itis estimated that the number of text messages sent daily by a high schoolstudent is normally distributed with a mean of 200 and a population standarddeviation of 50. What is the probability that a randomly chosen student sentless than 210 text messages that day?

Question 4

It is estimated that the number of text messages sent daily by ahigh school student is normally distributed with a mean of 200 and a populationstandard deviation of 50. The top ten percent send at least how many textmessages?