Answer both questions only put answers please 2774-STA2023 Summer 2018 Homework:

Question

Answer both questions only put answers please

2774-STA2023 Summer 2018 Homework: Section 5.2 Score: 0 of 1 pt (X) 5.2.21-T Latoya David &162418 11 of 20 (13 complete) MN Score: 54.64%, 10.93 of E Question Help Assume that when adults with smartphores in meetings or classos smartphon s nn donty se od 40% sot r in m e ngsor dassos 9 adu smartphone users are a donn cted, ind op bablity to a dy 7 of ham se her Tha probability is Round to four decimal places as needed.) Enter your answer in the answer box and then cick Check Answer MacBook

Explanation / Answer

1)

X ~ Binomial (n,p)

Where n = 9, p = 0.46

Binomial probability distribution is

P(X) = nCx px ( 1 - p)n-x

So,

P( X = 7) = 9C7 0.467 0.542

= 0.0458

b)

Given,

n = 8, p = 0.47

Binomial probability distribution is

P(X) = nCx px ( 1 - p)n-x

So,

P( X >= 3) = 1 - P( X <= 2)

= 1 - [ P( X = 0) + P( X = 1) + P( X = 2) ]

= 1 - [ 8C0 0.470 0.538 +8C1 0.471 0.537 +8C2 0.472 0.536 ]

= 1 - 0.1875

= 0.8125

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