Question

find the range of the given data : 25.7,16.3,2.8,21.7,24.3,22.7and 24.9

Answer 1

25.7-16.3=9.4
hope it helps..
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Answer 2

ANSWER WITH FULL EXPLANATION

Range is the difference between the highest value and the lowest value of the given data. 

In your given data, the highest value is 25.7 and the lowest value is 2,8. 

So, the range of the given data is $(25.7-2.8) = 22.9$

∴ The range of the given data is $22.9$. 

Hope this may help you. 

If you have any doubt, then you can ask me in the comments.