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A full time 1st year student at university takes 4 units per semester.  The prob...

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A full time 1st year student at university takes 4 units per semester.  The probability distribution function for the number of units in which you will achieve a grade of distinction (D) is :

x = number of grades at D

0

1

2

3

4

P(X = x)

0.10

0.39

0.31

0.15

0.05

What is the probability that such a student gets at LEAST 2 distinctions?

State your answer to two(2) decimal places only.

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