Standard Deviation and Coefficient of Variation for grouped data calculator

Class 2 - 4 4 - 6 6 - 8 8 - 10
Frequency 3 4 2 1
Class 20 - 25 25 - 30 30 - 35 35 - 40 40 - 45 45 - 50
Frequency 110 170 80 45 40 35
Class 10 - 20 20 - 30 30 - 40 40 - 50 50 - 60 60 - 70 70 - 80
Frequency 15 25 20 12 8 5 3
X 0 1 2 3 4
Frequency 1 5 10 6 3
X 10 11 12 13 14
Frequency 3 12 18 12 3
X 1.75 1.72 1.73 1.76 1.71 1.80 1.87 2.34
Frequency 3 2 4 5 6 2 7 1
X 0 1 2 3 4
Frequency 27 9 7 5 2
X 0 1 2 3 4
Frequency 17 9 6 5 3
Class -40 - -30 -30 - -20 -20 - -10 -10 - 0 0 - 10 10 - 20 20 - 30 30 - 40
Frequency 7 10 10 20 57 23 13 10
Class 0 - 2 2 - 4 4 - 6 6 - 8 8 - 10 10 - 12
Frequency 5 16 13 7 5 4
Class 0 - 2 2 - 4 4 - 6 6 - 8 8 - 10 10 - 12
Frequency 2 7 12 19 9 1
Class 15 - 20 20 - 25 25 - 30 30 - 35 35 - 40 40 - 45 45 - 50 50 - 55 55 - 60
Frequency 3 9 14 20 35 9 6 2 2