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

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Basic Math

Have you ever tried to get out of jury duty? About 25% of thosecalled will find an excuse (work, poor health, travel out of town,etc.) to avoid jury duty.†

(a) If 11 people are called for jury duty, what is theprobability that all 11 will be available to serve on the jury?(Round your answer to three decimal places.)


(b) If 11 people are called for jury duty, what is the probabilitythat 5 or more will not be available to serve on the jury?(Round your answer to three decimal places.)


(c) Find the expected number of those available to serve on thejury. What is the standard deviation? (Round your answers to twodecimal places.)

μ = people
σ = people


(d) How many people n must the jury commissioner contactto be 95.9% sure of finding at least 12 people who are available toserve? (Enter your answer as a whole number.)
people

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