The following distribution provides the annual net profit of 34 small companies:

Annual Net Profits ($K)

Number of Companies

65 up to 75

1

75 up to 85

6

85 up to 95

7

95 up to 105

12

105 up to 115

5

115 up to 125

3

(a)Find the approximate arithmetic mean annual net profit of the above grouped data.

(b) What is the approximate value of mode?

(c)What is the approximate value of range?

(d) What is the approximate median?

(e) Find the approximate variance and Standard derivation of the annual net profit for the above grouped data.