Question

3. The percentage of marks obtained by 100 students in an examination are as follows:
Marks 130-135 135-140 140-145 145-150 150-155 155-160 160-165
Frequency 10 15 18 22 23 8 4
The cumulative frequency of the class interval 150 - 155 is
2.90
b. 80
C. 100
d. 88​

Answer 1

Answer:

88

Step-by-step explanation:

Cf = 10, 25, 43, 65, 88 , 96, 100

Answer 2

Answer:

The cumulative frequency for class interval 150 - 155 is 88, choice d.

Step-by-step explanation:

To answer this question, let's first define what we mean by cumulative frequency.

Cumulative frequency = A running total frequencies. We get this by summing up the frequencies for the previous classes.

Lets work out the cumulative frequencies for the given data.

Class                                                                  Cumulative frequency

130-135                                                                    10

135-140                                                                    25

140-145                                                                    43

145-150                                                                    65

150-155                                                                    88

155-160                                                                    96

160-165                                                                    100

Therefore, the cumulative frequency for class interval 150 - 155 is 88, choice d.