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?

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?

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?

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 coefficient of correlations r is $\rm \frac{3}{4}$.

2. The means of x and y are 3 and 4 respectively.

Which of the above statements is/are correct?