The answer is 30
7(8)+4(2)-2(17)=30
n(A∪B)=n(A)+n(B)−n(A∪B)=50+60−40=70
n(AΔB)=n(A∪B)−n(A∩B)
⇒70−40=30.
Answer:
66
Step-by-step explanation:
54 + 12 =66
Answer:
About 16% percent of people should have IQ scores above 118.
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
68% of the measures are within 1 standard deviation of the mean.
95% of the measures are within 2 standard deviation of the mean.
99.7% of the measures are within 3 standard deviations of the mean.
In this problem, we have that:
Mean = 100
Standard deviation = 18
Using the empirical rule, about what percent of people should have IQ scores above 118?
118 = 100 + 18
By the Empirical Rule, 68% of the measures are within 1 standard deviation of the mean, that is, between 82 and 118. The other 32% is more than 1 standard deviation from the mean. Since the normal distribution is symmetric, 16% are below 82 and 16% are above 118
So
About 16% percent of people should have IQ scores above 118.
Answer:
297 cards in a year
Step-by-step explanation:
There are 12 months in a year, and he gets 2 packs of cards every month.
12*2 = 24 packs of cards a year
He gets 3 extra packs of cards for his birthday.
24 + 3 = 27 packs of cards
There are 11 cards in each pack.
27 X 11 = 297 cards in a year