Answer to Question #256817 in Statistics and Probability for rhea

Question #256817

Weekly revenues for a particular curry puff seller in Ang Mo Kio are normally distributed with mean $11,480 and standard deviation $1,165. For how many weeks per year would you expect revenues to be less than $8,150?


1
Expert's answer
2021-11-04T12:25:13-0400

P(X<8150)=P(xμσ<8150114801165)P(X<8150)=P(\frac{x-\mu}{\sigma}<\frac{8150-11480}{1165})


=P(Z<2.86)=P(Z<-2.86)


From Z normal distribution table;


P(X<8150)=0.0021P(X<8150)=0.0021


This means only 0.21% weeks per year would expect revenues to be less than $8,150.






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