The following frequency distribution was obtained by asking 50 randomly selected people to measure the length of their feet. Their answers are given to the nearest centimetre.
<i>Foot length (cm)</i>
20
21
22
23
24
25
26
27
28
29
30
<i>Frequency</i>
1
1
0
3
5
13
17
7
2
0
1
a. Between what limits are lengths rounded to 20 cm?
b. Rewrite the frequency table to show the data in the class intervals you have just described.
c. Hence draw a cumulative frequency graph for the data.
d. Estimate:
- i the median foot length
- ii the number of people with foot length 26 cm or more.