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irga5000 [103]
3 years ago
14

8) Keith had eighty - one dollars to spend on eight books. After buying them he had seventeen dollars.

Mathematics
2 answers:
Nezavi [6.7K]3 years ago
5 0

Answer:8 dollars per book

Step-by-step explanation:

Keith started with 81 dollars, and hadd seventeen dollars left over. Subtract 81 from 17 and you will get how much he spent. 64 dollars spent to buy books. Next you would divide 64 by 8, because 8 is the amount of books he bought. 64 divided by 8 is 8. So each book cost 8 dollars

Equation: (81-17) divided by 8

Yanka [14]3 years ago
4 0
You would do 81-17=64 because they had eighty one dollars in the beginning and 17 dollars left. then divide it by 8 because that is how many books were bought.
Equation: i’m not sure
Answer: 8
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fiasKO [112]

Answer:

8 1/4 or 8 2/8

Step-by-step explanation:

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1 2/8 + 7= 8 2/8

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Afina-wow [57]

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Step-by-step explanation:

For each employee hired, there are only two possible outcomes. Either it is a women, or it is not. The probability of an employee being a women is independent of any other employee, which means that the binomial probability distribution is used to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

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This means that n = 19

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This means that p = 0.5

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This is:

P(X \leq 4) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4)

In which

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

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P(X = 2) = C_{19,2}.(0.5)^{2}.(0.5)^{17} = 0.00032616

P(X = 3) = C_{19,3}.(0.5)^{3}.(0.5)^{16} = 0.00184822

P(X = 4) = C_{19,4}.(0.5)^{4}.(0.5)^{15} = 0.00739288

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P(X \leq 4) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4) = 0.00000191 + 0.00003624 + 0.00032616 + 0.00184822 + 0.00739288 = 0.00960541

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P(at most four) = 0.00960541

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