Question

The marks obtained by 20 students of a class in a test out of 20 marks are given below:

18, 10, 9, 15, 16, 10, 15, 19, 16, 12

12, 18, 17, 20, 10, 8, 15, 19, 10, 11

a. What is the mean marks?

b. What is the mode of the given data?

c. How many students scored less than the mean marks?​

Answer 1

Answer:

a. mean = sum of observations / total number of observations

sum of observations = 280

total number of observations = 20

280/20 = 280÷20 = 14

Mean = 14

b. mode = the observation which occurs most frequently

mode = 10

c. mean = 14

9 students scored less than the mean marks.