Question 393668: The probability that an employee at the company is over 30 years old is 0.7 if 15 employees are asked their age find the probability that
A) 5 are over 30 years old
B)at least 10 are over 30 years old
C) fewer than 8 are over 30
D)mean
E) variance
F) standard deviation
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The probability that an employee at the company is over 30 years old is 0.7
If 15 employees are asked their age find the probability that
A) 5 are over 30 years old
P(x = 5) = binompdf(15,0.7,5) = 0.0030
---------------------
B)at least 10 are over 30 years old
P(10<= x <=15) = 1-binomcdf(15,0.7,9) = 0.7216
---------------------
C) fewer than 8 are over 30
P(0<= x <=7) = binomcdf(15,0.7,7) = 0.0500
---
D)mean = np = 15*0.7
---
E) variance = npq = 15*0.7*0.3
---
F) standard deviation = sqrt(variance)
=========================================
cheers,
Stan H.
|
|
|
