W Mars 71%
A shop is recording the quwuing time of its customers and produces the
cumulative frequency graph shown below.
1001
a) How many customers queued for more
than 20 minutes?
80
customers
60
Cumulative frequency
40
b) Find the median queuing time.
20
minutes
0
5
0
5
10 15 20
Queuing time (mins)

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)

both the histogram and the stem and leaf plot will visually show how many shoppers were of various ages within each range of data.   the histogram does not give us the specific ages of these shoppers unlike the stem and leaf plot.a histogram does not give us a true range of the data because we do not know exactly how old the shoppers were. a stem and leaf plot will give exact ages, so we can determine the exact range along with all measures of center and the others measures of center.   with the histogram, we cannot find any of these.

step-by-step explanation: