290-10=280
280 is one standard deviation below.
All that are above mean is 50%.
One standard deviation below is 34%.
50%+34%=84% all of these bags weigh more than 280 g.
So,
100%-84%=16% should be bags that are less than 280 g.
Answer is b) 16 %.
Answer:
See Explanation
Step-by-step explanation:
The question is not clear. However, I will treat the question as:

and:


Solving:
and 

Divide both sides by 26


Divide both sides by 50

Solving
and 

Express 1 as 2^0

Remove bracket

Cancel out 2

Divide both sides by 6



Express 1 as 5^0

Cancel out 5^0

<span>A.1 - the difference between 5 and 6
B.7
C.6 - the difference between 7 and 1
D.5 - the difference between 7 and 2
E.2 - the difference between 7 and 5
Answer: The number 7 is not a difference between any 2 numbers. (Answer B)</span>
The answer is this is 9*4=36
Sum is to add up all the numbers.
-5 + (-9) + 10
= -5 -9 + 10
= -14 + 10
= 10 - 14
= -4.