Have you ever tried to get out of jury duty? About 25% of those called will find

Question

Have you ever tried to get out of jury duty? About 25% of those called will find an excuse (work, poor health, travel out of town, etc.) to avoid jury dutyt. If 11 people are called for jury duty, find the following. (a) What is the probability that all 11 will be available to serve on the jury? (Round your answer to three decimal places.) 0.042 (b) What is the probability that 5 or more will not be available to serve on the jury? (Round your answer to three decimal places.) 0.115 (c) Find the expected number of those available to serve on the jury. What is the standard deviation? (Round your answers to two decimal places.) ? | 2.80 ?-1 1 .44 X people people

Explanation / Answer

solution:-

given that n = 11 , p = 0.75 (available to serve)
(c) the expected number of those available to serve on the jury
? = n * p  
= 11 * 0.75
= 8.25

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