The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. what is the probability that a student uses between 400 and 500 minutes?

Let X be the number of cell phone minutes used by high school seniors.

X follows Normal distribution with mean μ = 500 and standard deviation σ =50.

The probability that students uses between 400 and 500 minutes is

P(400 < X < 500) =

= P( -2 < Z < 0)

= P(Z < 0) - P(Z < -2)

= 0.5 - 0.0228

P(400 < X < 500) = 0.4772

The probability that student uses between 400 and 500 minutes is 0.4772

area = length x width

length = 2 x width

32 = 2 x width x width

32 = 2 x width^2

36 = width ^2  

width = 6

length = 12

area is 32

perimeter = 2 x 12 + 2 x 6 = 24 + 12 = 36

step-by-step explanation: