What is 8/11 divided by 4

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?

Simplify 24÷(-2)(3)+7 a. -29 b. 3 c. 11

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?