If two regression lines between height (x) and weight (y) are 4y $$-$$ 15x + 410 = 0 and 30x $$-$$ 2y $$-$$ 825 = 0, then what will be the correlation coefficient between height and weight?

In an examination, 40% of candidates got second class. When the data are represented by a pie chart, wheat is the angle corresponding to second class?

Consider the following statements :

Statement 1 : Range is not a good measure of dispersion.

Statement 2 : Range is highly affected by the existence of extreme values.

Which one of the following is correct in respect of the above statements?

If the data are moderately non-symmetrical, then which one of the following empirical relationships is correct?