Required condition for being a probability distribution

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Show that it satisfies the required condition for being a probability distribution.

A calculus instructor uses computer aided instruction and allows students to take the midterm exam as many times as needed until a passing grade is obtained. Following is a record of the number of students in a class of 20 who took the test each number of times.

Students	Number of tests
10	1
7	2
2	3
1	4

Show that it satisfies the required condition for being a probability distribution.

Reference no: EM1320133

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