In a sample survey of $640$ people, it was found that $400$ people have a secondary school certificate. If a person is selected at random, what is the probability that the person does not have such certificate?

0.375

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0.625

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0.725

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0.875

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Solution

The correct option is A $0.375$

In a sample survey of 640 people, it was found that 400 people have a secondary school certificate.

person does not have such certificate $640 - 400 = 240$
Therefore the probability that the person does not have such certificate $P (E) = \frac{240}{640} = 0.375$

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In a sample survey of 640 people, it was found that 400 people have a secondary school certificate. If a person is selected at random, what is the probability that the person does not have such certificate?

The correct option is A 0.375In a sample survey of 640 people, it was found that 400 people have a secondary school certificate. person does not have such certificate640−400=240Therefore the probability that the person does not have such certificate P(E)=240640=0.375

In a sample survey of $640$ people, it was found that $400$ people have a secondary school certificate. If a person is selected at random, what is the probability that the person does not have such certificate?

The correct option is A $0.375$

In a sample survey of 640 people, it was found that 400 people have a secondary school certificate.

person does not have such certificate $640 - 400 = 240$
Therefore the probability that the person does not have such certificate $P (E) = \frac{240}{640} = 0.375$