question archive In the morning, about 28% of adults know what they will have for dinner
In the morning, about 28% of adults know what they will have for dinner
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In the morning, about 28% of adults know what they will have for dinner. If one morning, you ask 22 adults if they know what they will have for dinner, what is the probability that more than 7 will say yes?
Group of answer choices
0.167
0.122
0.423
0.256
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Answer:
0.256
Explanation:
Given , n = 22 , p = 0.28
We have to find P( x > 7 )
P( x > 7 ) = 1 - P( x <= 7 )
Using Excel function , " =BINOMDIST( x, n , p , 1 )"
P( x <= 7 ) = BINOMDIST(7, 22, 0.28, 1 ) = 0.744146
So, P( x > 7 ) = 1 - 0.744146 = 0.256
