A recent survey asked 90 students "How many hours do you spend on the computer in a typical day?" Of the 90 respondents 3 said 1 hour, 5 said 2 hours, 15 said 3 hours, 25 said 4 hours, 20 said 5 hours, 15 said 6 hours, 5 said 7 hours 1 said 8 hours and 1 said 9 hours. What is the average (mean) number of hours spent on the computer?

This question is based on the concept of mean. Therefore, 5 hours is the average (mean) number of hours spent on the computer.

Given:

A recent survey asked 90 students "How many hours do you spend on the computer in a typical day?" of the 90 respondents.

3 said - 1 hour,

5 said -  2 hours,

15 said - 3 hours,

25 said - 4 hours,

20 said  - 5 hours,

15 said - 6 hours,

5 said  - 7 hours

1 said - 8 hours and 1 said 9 hours.

We need to determined  the average (mean) number of hours spent on the computer.

By using the formula ,

Therefore, 5 hours is the average (mean) number of hours spent on the computer.

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5 hours.

Step-by-step explanation:

Add up all times and divide by the number of times.

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45

9 different times.

45 / 9 = 5

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

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step-by-step explanation: