There are 68 students of 9th standard from model Highschool, Nandpur. They have scored following marks out of 80, in written exam of mathematics. 70, 50, 60, 66, 45, 46, 38, 30, 40, 47, 56, 68,80, 79, 39, 43, 57, 61, 51, 32, 42, 43, 75, 43,36, 37, 61, 71, 32, 40, 45, 32, 36, 42, 43, 55,56, 62, 66, 72, 73, 78, 36, 46, 47, 52, 68, 78,80, 49, 59, 69, 65, 35, 46, 56, 57, 60, 36, 37,45, 42, 70, 37, 45, 66, 56, 47. By taking classes 30-40, 40-50, .... prepare the less than type cumulative frequency table Using the table, answer the following questions :
(i) How many students, have scored marks less than 80 ?(ii) How many students have scored marks less than 40 ?(iii) How many students have scored marks less than 60 ?
Answers
Answer:
66
14
45
Step-by-step explanation:
Class Frequency Cumulative Frequncey Less than
30-40 14 14
40-50 20 34
50-60 11 45
60-70 12 57
70-80 9 66
80 2 68
students scored marks less than 80 = 66
students scored marks less than 40 = 14
students scored marks less than 60 = 45
Answer:
i) Students scored marks less than 80 = 14 + 20 + 11 + 12 + 9 = 66
ii) Students scored marks less than 40 = 14
iii) Students scored marks less than 60 = 14 + 20 + 11 = 45
Step-by-step explanation:
In this question,
We have to prepare the less than type cumulative frequency table
Class Frequency Cumulative Frequncey Less than
30-40 14 14
40-50 20 14 + 20 = 34
50-60 11 34 + 11 = 45
60-70 12 45 + 12 = 57
70-80 9 57 + 9 = 66
80 2 66 + 2 = 68
i) Students scored marks less than 80 = 14 + 20 + 11 + 12 + 9 = 66
ii) Students scored marks less than 40 = 14
iii) Students scored marks less than 60 = 14 + 20 + 11 = 45