Question

(1) Reni completed part of her home work in 2 hours
3
How much part of the home work had she completed in 1
hours?
1
4​

Answer 1

Step-by-step explanation:

Given that

sin3A=cos(A−26)

cos(90−3A)=cos(A−26) [sinθ=cos(90−θ)]

Comparing angles

90−3A=A−26

−3A−A=−26−90

−4A=−116

A=

4

116

A=29

Answer 2

Answer:

distribution table for the given set of scores:

39,16,30,37,53,15,16,60,58,26,28,19,20,12,14,24, 59,21,57,38,25,36,24,15,25,41,52,45,60,63,18,26,43,36,18,27,59,63,46,25,33,46,42,48,35,64,24.Take class intervals as (10−20),(20−30),.... and answer the following:

(i) What does the frequency corresponding to the third class interval mean?

(ii) What is the size of each class interval? Find the midpoint of the class interval 30−40.