Question
There are 40 students in an elementary statistics class. On the basis of years of experience, the instructor knows that the time needed to grade
There are 40 students in an elementary statistics
class. On the basis of years of experience, the
instructor knows that the time needed to grade a
randomly chosen first examination paper is a
random variable with an expected value of
6 min and a standard deviation of 6 min.
a. If grading times are independent and the
instructor begins grading at 6:50 p.m. and
grades continuously, what is the (approximate)
probability that he is through grading
before the 11:00 p.m. TV news begins?
b. If the sports report begins at 11:10, what is the
probability that he misses part of the report if
he waits until grading is done before turning
on the TV?
Step by Step Solution
There are 3 Steps involved in it
Step: 1
Get Instant Access to Expert-Tailored Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started