Stage 9 - Q10 - 6 marks
20166
Four equal-width classes have midpoints 5, 15, 25, 35 and frequencies 4, x, 9, y. There are 34 observations and x is twice y. Complete and draw the frequency polygon. Could the same ratio condition hold if the total were 35 instead?
Hint
Frequencies count observations, so they must be non-negative integers.