Answer:
a)
i) Mean = 72
ii) Median = 72
iii) Mode = 72
b)
69, 70, 71, 72, 72, 72, 73, 74, 75
Step-by-step explanation:
<u>a. To find mean, median and mode</u>
It is given that all the 9 students get 72 marks.
Therefore the data set be,
72, 72, 72, 72, 72, 72, 72, 72 72
<u>i) mean </u>= (sum of data)/(total number of data)
= (9 * 72)/9 = 9
<u>ii) Median </u>- Central data in the data set when arranging ascending or descending order
72, 72, 72, 72, 72, 72, 72, 72 72
Median = 72
<u>iii) Mode </u>- Most repeating data in the data set
Here mode = 72
<u>b). To find a data set</u>
69, 70, 71, 72, 72, 72, 73, 74, 75
Here Mean, mode and median are all 72
= 40 %