Question

The temperature for the first 4 days in january was -2 degrees

the mean temperature for the first 5 days in january was 0 degrees

what was temperature on the 5th day ?
URGENT

Answer 1

let's assume the temperature on 5th day be x

We know that :

`\boxed{mean = (sum \: \: of \: all \: \: observations)/(number \: \: of \: \: observations) }`

So,

`\hookrightarrow \: 0 = ( - 2 + ( - 2) + ( - 2) + ( - 2) + x)/(5)`

`\hookrightarrow \: 0 * 5= - 2 - 2 - 2 - 2 + x`

`\hookrightarrow \: 0 = - 8 + x`

`\hookrightarrow \: x = 8`

Therefore, temperature on the fifth day was x = 8