(Answered) Chris is sitting a true-false statistics test which

Statistics

Chris is sitting a true-false statistics test, which consists of 13 items. After the test, Chris told you he didn't study for the test at all and guessed all answers.

(a) If Chris guessed each and every item in the test, describe the probability distribution for the number of correct guesses. Present the probability distribution in the form of a table using 6 decimal points in your answers. (Use Excel to calculate the probabilities.)

(b) Using the formula: E(X) = åXP(X), find out the number of correct answers Chris would expect to get. (You can use Excel to do the calculation. Just copy the Excel output onto your Word document.)

(d) What is the probability that Chris gets 11 or more correct answers for this test?

(e) When the result was released, Chris got 11 out of 13. Would you be surprised? Do you think Chris lied to you? Explain your answer.

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