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3 years ago

Nine is 15% of what number

Mathematics

2 answers:

rjkz [21]3 years ago

7 0

Answer:

Step-by-step explanation:

9/15 = 0.6

0.6 x 100 = 60

uysha [10]3 years ago

7 0

Answer:

Step-by-step explanation:

Let x be the number

15/100 * x = 9

multiply by 100

15x = 900 Divide by 15

x = 900/15

x = 60

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5 biscuits cost 40p altogether how much do 3 biscuits cost

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If 5 biscuits cost 40p

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4 years ago

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Step-by-step explanation:

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3 years ago

The quality assurance engineer of a receiving-sets manufacturer inspects receiving-sets in lots of 50. He selects 4 of the 50 re

Mariana [72]

Answer:

0.0430 = 4.30% probability that exactly 2 of the 4 receiving-sets selected by the engineer are defective.

Step-by-step explanation:

Sets are chosen from the sample without replacement, which means that the hypergeometric distribution is used to solve this question.

Hypergeometric distribution:

The probability of x successes is given by the following formula:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

In which:

x is the number of successes.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

Combinations formula:

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

$C_{n,x} = \frac{n!}{x!(n-x)!}$

In this question:

Lots of 50 means that $N = 50$

5 are defective, which means that $k = 5$

4 are selected, which means that $n = 4$

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This is $P(X = 2)$ . So

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

$P(X = 2) = h(2,50,4,5) = \frac{C_{5,2}*C_{45,2}}{C_{50,4}} = 0.0430$

0.0430 = 4.30% probability that exactly 2 of the 4 receiving-sets selected by the engineer are defective.

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Nine is 15% of what number￼

Nine is 15% of what number