24) (14p^ + 11p– 9p)– (-14 +5p5 - 11p2)

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?

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)