HOW TO FIND MEAN AND STANDARD DEVIATION FROM BAR GRAPH

Find the mean and standard deviation from the bar graph given below.

Problem 1 :

Solution :

By observing the above bar graph, it is clear that

The required,

mean = 8

and

standard deviation = 2

Problem 2 :

Solution :

By observing the above bar graph, it is clear that

The required,

mean = 8

and

standard deviation = 1.16

Problem 3 :

Solution :

By observing the above bar graph, it is clear that

The required,

mean = 7

and

standard deviation = 1.84

Problem 4 :

Solution :

By observing the above bar graph, it is clear that

The required,

mean = 13

and

standard deviation = 0.80

Problem 5 :

Solution :

By observing the above bar graph, it is clear that