Abus makes a stop at 2: 30,letting off 15 people and letting on 9.the bus makes another stop ten minutes later to let off 4 more people. how many more or fewer people are on the bus after the second stop compmare to the number of people on the bus before the 2: 30 stop?

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?

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details