Question

Determine the geometric mean of 8 and 12, to the nearest tenth.

A) 10.0
B) 4.5
C) 48.0
D) 9.8

Answer 1

D) 9.8

Explanation:

The geometric mean of two numbers x and y is

`√(xy)`

so
`√(8*12)` =
`√(96)`
`\approx 9.7979`

Which, since the 9 in the hundredths place is greater than 5, we can round up to 9.8