Find the Specified Probability The Professor Gives Each Student 10 Minutes

question 113

Multiple Choice

Find the specified probability.
-A statistics professor has office hours from 9:00 am to 10:00 am each day. The number of students waiting to see the professor is a random variable, X, with the distribution shown in the table. $$\begin{array} { c | c | c | c | c | c | c } \mathrm { x } & 0 & 1 & 2 & 3 & 4 & 5 \\\hline \mathrm { P } ( \mathrm { X } = \mathrm { x } ) & 0.05 & 0.10 & 0.40 & 0.25 & 0.15 & 0.05\end{array}$$ The professor gives each student 10 minutes. Determine the probability that a student arriving just
After 9:00 am will have to wait at least 30 minutes to see the professor.

• A) 0.25
• B)0.85
• C)0.15
• D)0.45

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