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Good Evening, What formula should I be using to solve the problem? Thank you A statistics student was about to hand in some homework when

Good Evening,

What formula should I be using to solve the problem? Thank you

A statistics student was about to hand in some homework when his friend pointed at his answers and said, "You may want to recheck those." The friend saw this:

The probability of the event is

a. 0

b. -0.8

c. 1.9

d. 0.77

Why is the friend so sure that some (or all) of these answers is/are not correct?

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