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neonofarm [45]
3 years ago
11

There are 3 seventh- grade boys,4 seventh-grade girls, 5 eighth grade boys, and 8 eight grade girls that have parts in the schoo

l play. One cast member will have the responsibility of introducing the play. That cast member will be chosen randomly. What is the probability that the student introducing the play will be a boy?
Mathematics
1 answer:
vodomira [7]3 years ago
7 0

Answer:

40%

Step-by-step explanation: 3 + 5 = 8 boys total   4 + 8 = 12 girls total   8 + 12 = 20 kids total. To find out the probability of randomly choosing a boy you have to do the number of boys over the total amount of kids (8/20) which will equal 40%.

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I want to know how to get the answer which is “3/10” can anyone tell me the steps to solving this probability problem?
Jobisdone [24]

Answer: Probability that a random chosen adult run or swims is given by

\frac{3}{10}

Explanation:

Since we have given that

Number of adults surveyed = 80

Number of adults regularly run for exercise = 22

Remaining number of adults regularly swims for exercise =18

Now, Let Event A : getting adults run for exercise

Event B : getting adults swims for exercise

So,

P(A)=\frac{22}{80}=\frac{11}{40}\\\\P(B)=\frac{18}{80}=\frac{9}{40}\\\\P(A\cap B)=\frac{1}{5}

As we know the formula , i.e.

P(A\cup B)=P(A)+P(B)-P(A\cap B)\\\\P(A\cup B)=\frac{11}{40}+\frac{9}{40}-\frac{1}{5}\\\\P(A\cup B)=\frac{11+9}{40}-\frac{1}{5}\\\\P(A\cup B)=\frac{20}{40}-\frac{1}{5}\\\\P(A\cup B)=\frac{1}{2}-\frac{1}{5}\\\\P(A\cup B)=\frac{5-2}{10}=\frac{3}{10}

Hence, Probability that a random chosen adult run or swims is given by

\frac{3}{10}

7 0
3 years ago
Which pairs of angles are alternate interior angles? Select all that apply.
mamaluj [8]

Answer:

9 and 10 i dont know why they have us doing this confusing  stuff

Step-by-step explanation:

8 0
2 years ago
The cube less the square of a number is twice the number. If x is a positive integer, what is its value
olga55 [171]

Answer:

2

Step-by-step explanation:

let 'x' = number

x³ - x² = 2x

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x(x² - x - 2) = 0

x(x - 2)(x + 1) = 0

x = -1, 0, 2

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3 0
3 years ago
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aalyn [17]
The answer would be i<span>n step 4, he made an error in determining which value is closer to 82.5</span>
6 0
3 years ago
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