1. (4 pts) A synthesis fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 80 psi and standard deviation 4 psi. Find the probability that a random sample of 9 fiber specimens will have sample mean tensile strength of at most 78 psi.

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

$79500

step-by-step explanation:

what