Problem 10: Statistics and Probability

Here are the solutions to the problems.

: Statistics and Probability

a) To draw a cumulative frequency curve, we first need to calculate the cumulative frequencies and upper class boundaries.
Let's assume the frequency for the 70-79 class is $x=4$, as it appears to be the most plausible value from the image.

Marks	Frequency (f)	Upper Class Boundary	Cumulative Frequency (CF)
0-19	0	19.5	0
20-29	6	29.5	6