Question in summary.

Question

A certain obstetrician found that 90% of the babies she delivered weighed x pounds, where |x-8.5| < or equal to 1. Determine the range of weights that corresponds to the given inequality

Answer 1

l x - 8.5 l ≤ 1

 

-1 ≤ x - 8.5 ≤ 1

 

7.5 ≤ x ≤ 9.5

 

So, 90% of the weights are between 7.5 lb and 9.5 lb.