Question

the grade distribution for students in the introductory statistics class at a local community college are displayed in the table. in this table, a = 4, b = 3, etc. let x represent the grade for a randomly selected student. what is the probability that a randomly selected student earned a c or better? 0.17 0.26 0.48 0.91

Explanation:

Step1: Identify grades of C or better

Grades of C or better are \(A = 4\), \(B = 3\), \(C=2\).

Step2: Sum their probabilities

Sum the probabilities of \(X = 4\), \(X = 3\), \(X = 2\).
\(P(X\geq2)=P(X = 4)+P(X = 3)+P(X = 2)\)
Substitute the values: \(0.43+0.31 + 0.17\)

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Answer:

\(0.91\)