1
NDA Mathematics 10 April 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following frequency distribution for the next three (03) items follow :

Class 0-20 20-40 40-60 60-80 80-100
Frequency 17 p + q 32 p - 3q 19

 

The total frequency is 120. The mean is 50.

What is the value of q ?
A
1
B
2
C
3
D
4
2
NDA Mathematics 10 April 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following frequency distribution for the next three (03) items follow :

Class 0-20 20-40 40-60 60-80 80-100
Frequency 17 p + q 32 p - 3q 19

 

The total frequency is 120. The mean is 50.

If the frequency of each class is doubled, then what would be the mean?
A
25
B
50
C
75
D
100
3
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
When the measure of central tendency is available in the form of mean, which one of the following is the most reliable and accurate measure of variability?
A
Range
B
Mean deviation
C
Standard deviation
D
Quartile deviation
4
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Direction: Consider the following for the next two (02) items that follow.

Two regression lines are given as 3x - 4y + 8 = 0 and 4x - 3y - 1 = 0.

Consider the following statements:

1. The regression line of y on x is $\rm y = \frac{3}{4}x+2$

2. The regression line of x on y is $\rm x = \frac{3}{4}y+\frac{1}{4}$

Which of the above statements is/are correct?

A
1 only
B
2 only
C
Both 1 and 2
D
Neither 1 nor 2
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