Question

The table shows the number of minutes spent doing different exercises. The mean spent exercising was 18.2 minutes. How many minutes were spent doing sit ups? (URGENT HELP) (ANSWER 4/11/19)

Answer 1

15

Explanation:

Call the unknown time x.

The mean is the sum of the numbers divided by the number of numbers.

There are 5 numbers.

(8 + 10 + 38 + x + 20)/5 = 18.2

(x + 76)/5 = 18.2

x + 76 = 91

x = 15

Answer 2

Explanation:

Add all the scores you do know

8 + 10 + 38 + 20 = 76

Now put in an ex for the situps.

76 + x

There are 5 subjects

(76 + x) /5 = 18.2

The average was 18.2

Multiply both sides by 5

5*(76 + x ) / 5 = 18.2 * 5

Cancel the left combine the right.

76 + x = 91

Subtract 76 from both sides

76 - 76 + x = 91 - 76

x = 15