The temperatures recorded in Kolkata during the first week of December are as follows:

25°, 30°, 29°, 28°, 31°, 28°, 24°

Find its arithmetic mean and round it off to the nearest whole number.

The given temperatures are 25°, 30°, 29°, 28°, 31°, 28°, 24°.

Sum of all the observations = 25 + 30 + 29 + 28 + 31 + 28 + 24

                                                  = 195

No. of observations = 7

∴ Arithmetic Mean of all observations = $\frac{{195}^{ }}{7} = {28}^{ }$

Thus, the arithmetic mean of the given temperatures is 28°.