(Please show step by step solution so I can easily understand thank you)

Answer the below question using D method

Classes	f	d
11.3 - 16.9	14	-2
16.9 22.5	30	-1
22.5 28.1	62	0
28.1 33.7	9	1
33.7 39.3	27	2
39.3 44.9	8	3
Total

a.) Mean

b.) Median

c. ) Mode

d.) Range

e.) Variance

f.) Standard deviation

g.) 75th Percentile