Hello,
g_m(15,1215)=√(5*1215)=9√15≈77,942286340....
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The number of people who voted follows a binomial distribution with probability of having voted

and

subjects, which means the approximating normal distribution should have mean

and standard deviation

.
With the continuity correction, you have
Answer: Lashawna scored 14 points
Step-by-step explanation:
Let M = Mary's score
L = Lashawna score
M = 28 points
And M is twice as much as L score
M= 2L
L= M/2
L= 28/2
M = 14.
Lashawna score was 14 points