ACT scores are normally distributed and from 2015 to 2017, the mean was 20.9 with a standard deviation of 5.6. A perfect score is 36. What percentage of the testers scored a perfect score?

Question 4 options:

0.46%

0.35%

99.65%

99.64%

A

Step-by-step explanation:

36 - 20.9 = 15.1

standard deviation = 5.6

15.1/5.6 = 2.696(428571)

So 2.7 times the standard deviation of people have a perfect score.

(which is a little less then 3 times the standard deviation)

This accounts for the population of the top 0.46 %

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this