A restaurant records the amount of time customers wait for a table on Saturday evenings. The table to the right lists the frequency of wait times for the last 100 customers.   Complete parts a) and b).        Number of Minutes     per Customer     Frequency     a. The approximate average wait time per customer is ____ minutes.     0 to under  10 7 ​b) Calculate the approximate variance and standard deviation of the wait time per customer.   10 to under 20 19      20 to under 30 10     30 to under 40  18        40 to under 50  30      50 to under 60 16

The dataset below is based on a survey of 100 randomly selected travelers who were asked, “How many trips per year do you typically take?”   2 or Fewer 3 to 5 Trips 6 to 8 Trips 9 or More Trips Male 17 10 20 3 Female 19 21 8 2 What is the probability that a randomly selected survey participant is male or takes two or fewer trips per year? Group of answer choices 0.36 0.69 0.86 0.17 0.18

The table below shows the number of books the Jefferson Middle school students readeach month for nine months. If the students read only 101 books for the month of June, which measure of central tendency will have the greatest change?A. All measures will have an equal change.B. The median will have the greatest change.C. The mean will have the greatest change.D. The mode will have the greatest change.

The highway speeds of 100 cars are summarized in the frequency distribution below. Find the estimated mean speed. Speed (mph) 30-39 40-49 50-59 60-69 70-79 Cars 3. 16 50 18 13 O A. 59.5 mph O B. 62.4 mph O C. 22.8 mph O D. 56.7 mph