Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

0.0051

Step-by-step explanation:

Given: Mean :

Standard deviation :

Sample size :

The formula to calculate z is given by :-

For x= 51

The P Value =

Hence, the probability that the sample mean hardness for a random sample of 8 pins is at least 51 =0.0051

false

step-by-step explanation:

4y - 6 + 4y^2 - 9

before simplifying this contains 4 terms

after simplifying

4y -15 + 4y^2

it contains 3 terms

the answer is d. (1.2, -4.7) on edgn

hope this !