1. A salesman keeps a record of the number of shops he visits each day.Shops visited 0 – 9 10 – 19 20 – 29 30 – 39 40 – 49Frequency 3 8 24 60 21(a) Estimate the mean number of shops visited.(b) Estimate the median.(c) What is the modal class?2. The weights of a number of students were recorded in kg.Weight (kg) 30 = w < 35 35 = w < 40 40 = w < 45 45 = w < 50 50 = w < 55Frequency 10 11 15 7 4(a) Estimate the mean weight. (b) Estimate the median.(c) What is the modal class?