The following data set shows the total number of people entering an exhibit per day: 163, 157, 166, 159, 160, 184, 162, 175, 177, 164, 171, 170, 173, 176, 173, 178, 158, 163, 164, 169, 171, 160, 165, 182 Which intervals for the data values would be most appropriate for a frequency table?

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Events a and b are independent. the probability of a occurring is 2/5. the probability of b occurring is 1/4. what is p(a and b)?