Answer:
n = 110
Step-by-step explanation:
Margin of Error :
Zcritical * s/ sqrt(n)
s = standard deviation = 4
Margin of Error = ±0.75
Zcritical at 95% level of confidence = 1.96
Margin of Error = Zcritical * s/ sqrt(n)
0.75 = 1.96 * 4 / sqrt(n)
0.75 = 7.84 / sqrt(n)
Take the square of both sides
0.5625 = 61.4656 / n
0.5625 * n = 61.4656
0.5625 = 61.4656
n = 61.4656 / 0.5625
n = 109.27217
About 110 samples
Answer:
(-6,-2)
Step-by-step explanation:
Answer:
2:5
Step-by-step explanation:
They can both be divided by 3.
6 divided by 3 is 2, while 15 divided by 3 is 5
Boys:Girls
6:15
<u>2:5</u>
Answer:
A = 176.7 units²
Step-by-step explanation:
Put the hint to use. Do these side lengths reflect the Pythagorean Theorem?
9^2 + 12^2 = 15^2?
81 + 144 = 225? YES
Therefore, this is a right triangle, and the diameter is 15 units.
Thus, the radius is 15/2 units, and the area is A = πr², or
A = π(15/2 units)² = (225/4)π units². Using 3.14 for π, we get:
A = 176.7 units²