A driving exam consists of 26 multiple-choice questions. Each of the 26 answers is either right or wrong. Suppose the probability that a student makes fewer than 7 mistakes on the exam is 0.21 and that the probability that a student makes from 7 to 15 (inclusive) mistakes is 0.58. Find the probability of each of the following outcomes. a. A student makes more than 15 mistakes

Question

Heather Hayden

Mathematics

26 November, 07:53

A driving exam consists of 26 multiple-choice questions. Each of the 26 answers is either right or wrong. Suppose the probability that a student makes fewer than 7 mistakes on the exam is 0.21 and that the probability that a student makes from 7 to 15 (inclusive) mistakes is 0.58. Find the probability of each of the following outcomes. a. A student makes more than 15 mistakes

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Vivian · Answer 1

The probability that a student makes more than 15 mistakes is 21% or 0.21

Step-by-step explanation:

To get the probability of making more than 15 mistakes we have to use the information of the others possibilities

Probability A=Probability of making 7 mistakes on the exam is 0.21

Probability B = Probability that a student makes from 7 to 15 (inclusive) mistakes is 0.58.

Probability C=The other option is making more than 15 mistakes.

We consider we have only those 3 options so they have to make the 100%

3 options = 100% = probability A + Probability B + Probability C

Then, Probability C = 100%-probability A - Probability B

Probability C = 100%-21% - 58%

Probability C = 21%