As the sum of marks of others remain unchanged , let their sum be x . As the mean using 83 was 40 , we have ,
(x +83)/100 = 40
x + 83 = 4000
x = 3917
Now mean using 53 ,
(x +53)/100
(3917+53)/100
39.7.
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Answer:

Step-by-step explanation:

The slope is the change of y over the change of x.

Therefore, the slope is -3.
Answer:
energy D
Step-by-step explanation: