2 years ago

There’s 25 questions in a test how many question do you have to get right to get 80%

Mathematics

2 answers:

IgorC [24]2 years ago

4 0

Answer:

Step-by-step explanation:

25*0.80 is 20

BartSMP [9]2 years ago

3 0

Answer:

Step-by-step explanation:

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diamong [38]

Answer:

g(-3) = 0

Step-by-step explanation:

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g(-3) = (-3)² + 3(-3) = 9-9 =0

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Step-by-step explanation:

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the probability that a twelve year old has a brother or sister is 25%. suppose you survey 300 twelve year olds. about how many d

Genrish500 [490]

Answer:

n(B U S) = 75

Step-by-step explanation:

Explanation:-

Probability:-

P(E) = $\frac{number of elements events in E}{total number of elementary events in the random experiment}$

$P(E) = \frac{m}{n}$

Let 'B' be the event of having twelve year old brother

Let 'S' be the event of having twelve year old sister

given data P(BUS) = 0.25

given total survey n(survey) = 300

we have to find the value is n(BUS) =?

we will use probability definition we get, P( BUS) = $\frac{n(BUS)}{n(survey)}$

substitute given values, we will get solution

$0.25 = \frac{n(BUS)}{300}$

after cross multiplication , we get

n(BUS) = 0.25 X 300

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2 years ago