The mean and the range of the set of numbers 1.20, 1.00, 0.90, 1.40, 0.80,...

The mean and the range of the set of numbers 1.20, 1.00, 0.90, 1.40, 0.80, 1.20, and 1.10 are m and r, respectively. Find m + r

Given:1.20, 1.00, 0.90, 1.40, 0.80, 1.20, 1.10
Sum of the numbers = 1.20 + 1.00 + 0.90 + 1.40 + 0.80 + 1.20 + 1.10
= 7.60

Number of terms = 7

Mean, m = 7.60 ÷ 7 = 1.0857 (to 4 d.p.)
Highest value = 1.40
Lowest value = 0.80

Range, r = 1.40 − 0.80 = 0.60
m + r = 1.0857 + 0.60 = 1.6857 closest to 1.65.

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