City buses have an average of 2200 daily riders. during a gas shortage, the average number was 2376. what percent did the average increase?

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?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Acar loses a quarter of its value every year. it is originally worth $35,000. to the nearest dollar,how much will the car be worth in 8 years?