Calculate the mean, variance, and range for the given frequency distribution of haemoglobin levels.

Question 1 (a)

To calculate the mean, variance, and range for the given frequency distribution, we first need to determine the midpoint ($x_i$) for each class interval.

Haemoglobin (g/100ml)	Number of Women ($f_i$)	Midpoint ($x_i$)	$f_i x_i$	$(x_i - \bar{x})^2$	$f_i (x_i - \bar{x})^2$
8.0 – 8.9	1	8.45	8.45	11.055625	11.055625
9.0 – 9.9	3	9.45	28.35	5.405625	16.216875
10.0 – 10.9	24	10.45	250.80	1.755625	42.135
11.0 – 11.9	19	11.45	217.55	0.105625	2.006875
12.0 – 12.9	14	12