Answer:
Note that we need calculate the scores between the mean (
) and the mean plus 3 times the standard deviation. It is 3 times since the distance between the values given (513 and 759) divided by the standard deviation is 3 (
)
So the rule say that 99.7% of data is between
and
, as it is a normal distribution half of 99.7% is between
and
. Hence 49.85% of people score between 513 and 759.
Answer:
10.3
Step-by-step explanation:

(Army?
Answer:
Correct Option is d 
Step-by-step explanation:
For completing the square our equation should be in the form of 
In the given equation we have:

Correct Option is d 