Answer:
a). Yes
We can have multiple values above or below 70that can still sum up to 280
b).yes, if all numbers are 70.
C).no, all numbers can not be below 70.
The sum will not be equal to 280 again
D). Yeah.it is
This is possible if the numbers can still balance up to 280.
Step-by-step explanation:
Given the mean to be 70 generally.
And total of the score =70*4
Total score = 280.
A). It's possible that the scores none are 70.
We can have values like 69,68,72,71
The above numbers can still give a meam of 70
And a total of 280.
B). It's possible
The test score can be all same if the scores are all 70.
It will still give total of 280 and mean of 70
C). It's not possible
Imagine the numbers are all 69,69,69,69.
Just number below 70 for the four of them will give us total of 276
And a mean below 70.
D). Yeah it is possible
The possibility occurs when the remaining number out of the four is way below 70.
Example.
20, 80,100,80
The sum of the above= 280
Mean = 70
