Suppose that daycare costs are normally distributed with a mean ...

[bclement10]

Suppose that daycare costs are normally distributed with a mean equal to 10,000 a year and a standard deviation equal to 2,000. What percentage of daycare centers will cost between 5,600 and 12,800?

Question 2

Suppose that daycare costs are normally distributed with a mean equal to 10,000 a year and a standard deviation equal to 2,000. What percentage of daycare centers will cost between 7,400 and 11,000?

[janeli1]

Answer to Question 1

P(5,600 < x < 12,800) = P(-2.20 < z < 1.40) = 0.4861 + 0.4192 = 0.9053

Answer to Question 2

P(7,400 < x < 11,000) = P(-1.30 < z < 0.50) = 0.4032 + 0.1915 = 0.5947

[bclement10]

Wow, this really help

[xiazhe]

Thanks for the timely response, appreciate it