To find the standard error, divide the standard deviation by the square root of the sample size
standard deviation = 7.5
sample size = 25......sqrt 25 = 5
standard error = 7.5 / 5 = 1.5 <==
88/106 x 100
.830188679 x 100
83.02%
Answer:
-4 --8
-4+8
4
Step-by-step explanation:
The answer is A.
I used the formula for finding the vertex of a parabola and I got the first answer choice. So A is correct. :)
