The 6:00 a.m. temperatures for four consecutive days in the town of Lincoln were -12.1 C, -7.8 C, -14.3 C, and 7.2 °C. What was the average 6:00 am temperature for the four days?

Nov 18, 2016

See explanation.

Explanation:

To calculate the average (mean) value of a set of numbers you have to add all the numbers and divide the sum by the number of measured values.

$\overline{x} = \frac{{x}_{1} + {x}_{2} + \ldots + {x}_{n}}{n}$

Here we have:

n=4

$\overline{x} = \frac{- 12.1 + \left(- 7.8\right) + \left(- 14.3\right) + 7.2}{4}$

$\overline{x} = - \frac{27}{4}$

$\overline{x} = - 6.75$

Answer: The average temperature is $\overline{x} = - 6.75$