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2 years ago

1 point

Mathematics

1 answer:

damaskus [11]2 years ago

8 0

Answer:

Step-by-step explanation:

I think the question is card(A)=20,card(B)=15,card(A∩B)=10, then what iscard(A∪B)

You can solve this question by drawing a picture like this to visualize the problem.

Thus the answer is card(A∪B)=card(A)+card(B)−card(A∩B)=25

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A model spaceship costs $15.99 before tax. The tax on the model spaceship is 8%.

Vlad1618 [11]

15.99×8/100=1.28$ this is the tax
to get the total cost 15.99+1.28= 17.27$

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2 years ago

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Serhud [2]

Answer:

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Step-by-step explanation:

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2 years ago

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gavmur [86]

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2 years ago

1)An employee’s hourly raise went up from 10$ per hour to 12$ per hour. What is the rate of increase?

Step2247 [10]

1- went up 20%

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2 years ago

If IQ scores are normally distributed with a mean of 100 and a standard deviation of 5, what is the probability that a person se

notsponge [240]

Answer:

2.28% probability that a person selected at random will have an IQ of 110 or higher

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

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 problem, we have that:

$\mu = 100, \sigma = 5$

What is the probability that a person selected at random will have an IQ of 110 or higher?

This is 1 subtracted by the pvalue of Z when X = 110. So

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{110 - 100}{5}$

$Z = 2$

$Z = 2$ has a pvalue of 0.0228

2.28% probability that a person selected at random will have an IQ of 110 or higher

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2 years ago