The soccer balls manufactured at a factory have pressures that are Normally distributed, with a mean pressure of 8.7 PSI and a standard deviation of 0.2 PSI. What percentage of soccer balls from the factory have a pressure between 8.1 and 8.7 PSI? 0.3% 49.85% 50% 99.7%

50%.

Step-by-step explanation:

Calculate the z scores

z score = n - m / d    where n = given value , m = mean and d = standard deviation.

So for a pressure of 8.1

z1 = 8.1-8.7/02 = -3

z2 = 8.8-8.7/0,2 = 0

So from  the Standard Normal Distribution tables the required percentage

= 100 - 0.00135 - 50

= 49.9999

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation:

a

step-by-step explanation: