The average number of hours that a student spends per day wo

The average number of hours that a student spends per day working at a computer is 4.3 hours. This distribution is normally distributed with a standard deviation of 0.8 hours. What percentage of students spend more than 5.5 hours per day working at a computer? Give your answer as a decimal rounded to four decimal places.

Solution

The average number of hours that a student spends per day working at a computer is 4.3 hours. This distribution is normally distributed with a standard deviation of 0.8 hours. What percentage of students spend more than 5.5 hours per day working at a computer? Give your answer as a decimal rounded to four decimal places.

Z value for 5.5, ( 5.5-4.3)/0.8 = 1.5

P( x >5.5) = p( z > 1.5) = 0.066807

Percentage = 0.066807*100 =6.6807%

The required value = 6.6807%