Answer:
Step-by-step explanation:
1/2 n+40 =55
−40 −40
1/2 n = 15
*2 *2
n = 30
Answer:
A - x=6
B - x=3
C - x=21
D - x=50
E - x=8
F - x=12
G - x=1
H - x=15
I - x=21
J - x=6
K - x=15
L - x=1
M - x=50
N - x=12
O - x=8
P - x=3
Step-by-step explanation:
Answer:
x=48
Step-by-step explanation:
The other angle is 66° because it's an isosceles triangle
so
180=66+66+x
180=132+x
x=48
Answer:
38.3% of the people taking the test score between 400 and 500
Step-by-step explanation:
When the distribution is normal, we use the z-score formula.
In a set with mean and standard deviation , the zscore of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
In this question, we have that:
What percentage of the people taking the test score between 400 and 500
We have to find the pvalue of Z when X = 500 subtracted by the pvalue of Z when X = 400. So
X = 500
has a pvalue of 0.6915
X = 400
has a pvalue of 0.3085
0.6915 - 0.3085 = 0.383
38.3% of the people taking the test score between 400 and 500