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3 years ago

Amit is going to guess on all

Mathematics

2 answers:

tigry1 [53]3 years ago

7 0

Answer:

Close to five but not exactly 5

Step-by-step explanation:

Khan Academy

Papessa [141]3 years ago

4 0

Answer:

The best prediction for the number of questions that Amit will answer correctly is 5.

Step-by-step explanation:

Each question can be considered as an independent Bernoulli trial. This implies that we have 20 independent trials.

Now, the probability of making a correct guess on each question is;

1/4. This is because we have 4 choices per question and only 1 is correct.

If we now let the random variable X denote the number of questions that Amit will answer correctly, then X is a Binomial random variable with parameters;

20 and 1/4.

The expected number of correct answers is simply the product of these two values;

20 * (1/4) = 5

Therefore, the best prediction for the number of questions that Amit will answer correctly is 5

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Answer:

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Step-by-step explanation:

As given

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Thus

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4 years ago

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shusha [124]

Answer:

Step-by-step explanation:

You can reason your way through this without a calculator:

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