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A test consists of 100 multiple choice questions, each with five possible
answers, only one of which is correct. A student randomly guesses at all
100 questions.
Use the Mean And Standard deviation to determine how many questions correct we could usually expect from a student who randomly guesses at all 100 questions.

A test consists of 100 multiple choice questions each with five possible answers only one of which is correct A student randomly guesses at all 100 questions Us class=

Respuesta :

Mean = 20; standard deviation = 4;

Let x be the success of receiving the right response.

The total number of trials in this case is 100.

The likelihood of receiving the right response is p = 1/5.

In light of the average number of correct answer;

μₓ = np

μₓ = 100 * (1/5);

μₓ = 20;

The standard deviation is now; σ = √(n)(p)(1 - p)

                                                    σ = √(100)(1/5)(4/5)

                                                   σ  = 4

To learn more about standard deviation, visit: https://brainly.com/question/11738379

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