The probability that a student gets a multiple-choice question correct on a statistics test is 0.80. Use the normal approximation to the binomial method to find the probability that a student gets a B or a C (21-26 correct answers) on a test with 30 questions. To calculate the probability, what is the upper and lower bounds of the normal approximation

0.7341 is the probability that a student gets a B or a C.

Step-by-step explanation:

We are given the following in the question:

Probability that a student gets a multiple-choice question correct  =

p = 0.80

Sample size, n = 30

We use the normal approximation to binomial distribution to solve this.

We have to evaluate:

a) Upper bound of marks

x = 26

Calculation the value from standard normal z table, we have,  

b) Lower bound of marks

x = 21

Calculation the value from standard normal z table, we have,  

c) probability that a student gets a B or a C

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step-by-step explanation:

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