Question

Tom recorded the outdoor temperature for 8 consecutive days. Seven of those temperatures were 71, 80, 69, 80, 73, 77, and 70. The average for all 8 days was 75. What was the temperature on the eighth day?​

Answer 1

The temperature on the eighth day is 80.

Explanation:

Let t = temperature on the eighth day.

`(71 + 80 + 69 + 80 + 73 +77+ 70 + t)/(8) = 75`

`(520 + t)/(8) = 75`

`520 + t = 600`

`t = 80`