Question

The mean temperature for the first 7 days in January was 8 °C.

The temperature on the 8th day was -1 °C.
What is the mean temperature for the first 8 days in January?

PLEASE HELP ME WITH THIS.

Answer 1

6.875° C

the mean of a set of data is calculated using

mean =
`(sum)/(count)`

For the first 7 days the mean is 8 and the count = 7

8 =
`(sum)/(7)` ( cross- multiply )

sum = 8 × 7 = 56

Add on the temperature on the 8 th day to the sum and divide by 8 for mean

sum = 56 - 1 = 55

mean =
`(55)/(8)` = 6.875° C