Assume that the life expectancy for one region is normally distributed with a mean of 71.04 years and a standard deviation of 8.23 years. Use the accompanying graphic to answer the questions. (a)
What is the approximate percentile for one city with a life expectancy of 81.33?
(b)
What percentage of cities in the region have a life expectancy greater than 87.50 ( 2 standard deviation above the mean)?
c)
Approximately99 % of cities in the region have a life expectancy between what two values?

24

step-by-step explanation:

step-by-step explanation:

y = | -2(-2) |     →     y = | 4 |     →     y = 4       ⇒   (-2, 4)

y = | -2(-1) |     →     y = | 2 |     →       y =   2       ⇒   (-1, 2)    

y = | -2(0) |     →     y = | 0 |     →       y = 0         ⇒   (0, 0)

y = | -2(1) |   c →     y = | -2 |     →     y =   2         ⇒   (1, 2)    

y = | -2(2) |     →     y = | - 4 |     →     y =   4         ⇒   (2, 4)  

answer: b

step-by-step explanation: