4.
Least Square Method of fitting a line (the line of best fit or the regression line) through the scatter diagram is a method, which . . . . . . . . the sum of the squared vertical deviations from the fitted line.

7.
Husband and wife apply for two vacant spots in a company. If the probability of wife getting selected and husband getting selected are 3/7 and 2/3 respectively, what is the probability that neither of them will be selected?

8.
Assertion (A) Normal distribution curve is a bell shaped curve where mean, median and mode are equal to each other.
Reason (R) As the same size increases, all small-sample tests tends to merge with normal distribution.