Complete the table with the number of sit-ups you have to do sunday so that the mean number of sit-ups per day is 100 monday- 100 tuesday-65 wednesday-120 thursday-150 friday- 90 saturday-0 sunday- ? ?

The mean is the average of the numbers.

It is easy to calculate: add up all the numbers, then divide by how many numbers there are.

Let the number of sit-ups you have to do Sunday be x. Then the sum of all sit-ups is

100+65+120+150+90+0+x=525+x.

The number of days is 7.

Thus, the mean is

You know that the mean number of sit-ups per day is 100, equate these two means and solve the equation:

175 sit-ups

he spend 5.1 minutes chatting with his friends

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5 1/10