The length of time it takes students to complete a statistics ...

[theo]

The length of time it takes students to complete a statistics examination is uniformly distributed and varies between 40 and 60 minutes.
 a. Find the mathematical expression for the probability density function.
  b. Compute the probability that a student will take between 45 and 50 minutes to complete the examination.
 c. Compute the probability that a student will take no more than 40 minutes to complete the examination.
 d. What is the expected amount of time it takes a student to complete the examination?
  e. What is the variance for the amount of time it takes a student to complete the examination?

Question 2

The general form of an interval estimate of a population mean or population proportion is the _____ plus or minus the _____.
 a. population mean, standard error
  b. level of significance, degrees of freedom
  c. point estimate, margin of error
  d. planning value, confidence coefficient

[Kdiggy]

Answer to Question 1

a. f(x) = .05 for 40  x  60; 0 elsewhere
b. .25
c. 0
d. 50 minutes
e. 33.33 (minutes)2

Answer to Question 2

c

[theo]

YES! Correct, THANKS for helping me on my review

[xiaomengxian]

Excellent