Your company manufactures hot water heaters. the life spans of your product are known to be normally distributed with a mean of 13 years and a standard deviation of 1.5 years. what is the probability that the mean life span in a group of 10 randomly selected hot water heaters is between 12 and 15 years? (round to the nearest ten-thousandth.)

A local maximum of the function f(x) occurs when x =Step-by-step explanation:

use formula for the circle a=3.14

step-by-step explanation:

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)