Mathematics

Grade10

Easy

Question

# Answer the following with the help of the data given below:

There are two brands of light bulbs which are brand M and Brand J. Here are the life spans of both brands (in hrs):

Brand M : 100 , 200 , 150 ,120 , 140 , 100

Brand J : 120 , 180 , 190 , 140 , 130 , 110

Which of the brands have a high standard deviation?

- Brand J
- Brand M
- Both a and b
- None of the above

## The correct answer is: Brand M

### The mean for Brand M=135

The standard deviation for Brand M=

The mean for Brand J=145

The standard deviation for Brand J=

Brand M have high standard deviation.

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There are two brands of light bulbs which are brand M and Brand J. Here are the life spans of both brands (in hrs):

Brand M : 100 , 200 , 150 ,120 , 140 , 100

Brand J : 120 , 180 , 190 , 140 , 130 , 110

Which of the brands have a high average life span?

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