Determine P(-2.45 z 1.69), assuming a standard normal ...

[jenna1]

Determine P(-2.45  z  1.69), assuming a standard normal distribution.

Question 2

The amount of time spent by American adults playing sports per day is normally distributed with a mean of 4 hours and standard deviation of 1.25 hours. Find the probability that if four American adults are randomly selected, their average number of hours spent playing sports is more than 5 hours per day.

[jointhecircus]

Answer to Question 1

0.9474

Answer to Question 2

0.0548