Please solve with explanation

Question -3 CR Given the following distribution of weekly household income: Household income (f) % of all households Under 30 13.7 30 but under 40 7.6 40 but under 60 11.6 60 but under 80 13.4 80 but under 100 14.2 100 but under 120 13.0 120 but under 150 12.3 150 or more 14.2 a. calculate the mean and standard deviation; b estimate the percentage of households with a weekly income below the mean; C. determine the median and quartile deviation