... dard deviation of the number of students called on is two decimal places as needed.)
... dard deviation of the number of students called on is two decimal places as needed.)
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 50E: Flexible Work Hours In a recent survey, people were asked whether they would prefer to work flexible...
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A teacher uses a program that randomly chooses a student in the class to "volunteer" to answer a question. The
teacher will stop choosing students once a student gets the right answer, but if the teacher is given four wrong
answers in a row, he will stop and help the class himself. He estimates that 88% of the students in the class know the
correct answer. A probability model for the number of students called on, whose expected value is 1.14, is shown
below. Find the standard deviation of the number of students called on.
Number of students
Probability
1
0.88
2
0.1056
C
3
0.012672
4
0.001728
The standard deviation of the number of students called on is student(s).
(Round to two decimal places as needed.)
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