Question

Marie calculates the average number of children in families in her village. five families live in the village. which answer could she not get?

A. 1•0
B. 1•2
C. 1•3
D. 1•4
E. 2•0

Answer 1

C. 1•3

Explanation:

You want to know which number could not be the average of 5 integers:

• 1.0
• 1.2
• 1.3
• 1.4
• 2.0

Average

The total number of children in the village will be an integer. The average per family will be found by dividing that total by the number of families: 5.

The quotient from that division must be an integer multiple of 1/5 = 0.2. The number 1.3 is not an integer multiple of 0.2.

The number Marie could not get is 1.3.

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