At a customer service call center for a large company, the number of calls received per hour is normally distributed with a mean of 170 calls and a standard deviation of 20 calls. What is the probability that during a given hour of the day there will be less than 158 calls, to the nearest thousandth?

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

Which statement about the graph of y = 8(0.25)^2

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?