Mackayla withdrew a total of $100 from her bank account over 4 days. She withdrew the same amount
each day. By how much did the amount in her bank
account change each day? What operation can you
use to solve this problem?

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?

Ajar of gumballs contains 4 reds, 2 greens, and 6 blues. what is the probability of getting two blues in a row without replacement?

How to do this , and can some one explain