Question 469027
With probability 0.05 a robotic reporter that works for MEOW NEWS will make a false statement.
Suppose the reporter produced 1900 statements last week. 
12. (1 point) What is the expected number of false statements, and the standard deviation?
---
E(x) = np = 1900*0.05 = 5*19 = 95
std = sqrt(npq) = sqrt[95*0.95] = 9.5

----------------------------------- 
13. (1 point) What is the probability that 85 or fewer of those statements were false? Round answer to four places after the decimal point.
---
P(0<= x <= 85) = binomcdf(1900,0.05,85) = 0.1586
----------------------------------------------------- 
14. (1 point) What is the probability that 124 or more of those statements were false? Round answer to four places after the decimal point.
P(124 <= x <= 1900) = 1 - binomcdf(1900,0.05,123) = 0.0019
==============================================================
Cheers,
Stan H. 
-------------------------------------------------------------------