The playing life of a Sunshine radio is normally distributed with mean LaTeX: \muμ = 600 hours and standard deviation LaTeX: \sigmaσ = 100 hours. What is the probability that a radio selected at random will last from 600 to 700 hours? b. Find the area under the standard normal curve to the left of z = –1.00
c. Find the area to the left of z = 1.18
d. Find the area between z = 1.00 and z = 2.70.

12*c

step-by-step explanation:

a; x = 0.5

step-by-step explanation:

-10x = -5

x = 0.5

look at photo

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: