Question Details

QNT 275 Week 3 QUIZ

question 1
A continuous random variable has the uniform distribution on the interval [a, b] if its probability density functionf(x) ___________.


question 2
You work in marketing for a company that produces work boots. Quality control has sent you a memo detailing the length of time before the boots wear out under heavy use. They find that the boots wear out in an average of 208 days, but the exact amount of time varies, following a normal distribution with a standard deviation of 14 days. For an upcoming ad campaign, you need to know the percent of the pairs that last longer than six months-that is, 180 days. Use the empirical rule to approximate this percent.


question 3
For any normally distributed random variable with mean μ and standard deviation σ, the percent of the observations that fall between   and    is closest to _______. 

question 4
Which of the following can be represented by a continuous random variable?

question 5
What is probability? 


question 6
What does it mean when we say that the tails of the normal curve are asymptotic to the x axis?


question 7
Which of the following can be represented by a discrete random variable?


question 8
The probability that a normal random variable is less than its mean is ____. 

question 9
Mutually exclusive and collectively exhaustive events _______________.


question 10
Which of the following is correct?