Suppose a study of speeding violations and drivers who use c…

Suppose a study of speeding violations and drivers who use cell phones produced the following fictional data: Speeding Violation No Speeding Violation Total Cellphone user 25 280 305 Not a cellphone user 45 405 450 Total 70 685 755 The probability that a person had no violation last year GIVEN that person was not a car cellphone user is . (keep two decimal places for your answer)

There are 45 students in a class and 5 students were randoml…

There are 45 students in a class and 5 students were randomly selected from this class and their heights (in cm) were recorded as follows: 145cm, 135cm, 150cm, 140cm, and 150cm. What is the variance of the heights for the selected 5 students (keep two decimal places for your answers)?

Suppose a study of speeding violations and drivers who use c…

Suppose a study of speeding violations and drivers who use cell phones produced the following fictional data: Speeding Violation No Speeding Violation Total Cellphone user 25 280 305 Not a cellphone user 45 405 450 Total 70 685 755 The probability that a person is a car cellphone user OR had no violation in the last year is . (keep two decimal places for your answer)