Question

A meteorologist predicted 28 mm of rain on Friday. The actual amount of rain measures 35 mm. What's the percent error in the meteorologist's prediction? Help plz

Answer 1

Given:

Predicted value of rain = 28 mm

Actual amount of rain = 35 mm

To find:

The percent error.

Solution:

We know that,

`\text{Percent error}=\frac{\text{Predicted value - Actual value}}{\text{Actual value}}* 100`

On substituting the values, we get

`\text{Percent error}=(28-35)/(35)* 100`

`\text{Percent error}=(-7)/(35)* 100`

`\text{Percent error}=(-1)/(5)* 100`

`\text{Percent error}=-20\%`

Therefore, the percent error is -20%.