What Formula to use:
Q:
The incomes of trainees at a local mill are normally distributed with a mean of $1,100 and a
standard deviation of $150. What percentage of trainees earn less than $900 a month? Round
your answer to the nearest hundredth of a percent.
A:
Normalcdf
Q:
Assume that the number of pieces of junk mail per day that a person receives in their mailbox
follows the Poisson distribution and averages 4.3 pieces per day. What is the probability that this
person will receive exactly four pieces of junk mail over the next two days? Round to four
decimal places as needed.
A:
Poissonpdf
Q:
Based on a Comcast survey, there is a 0.8 probability that a randomly selected adult will
watch prime-time TV live, instead of online, on DVR, etc. Assume that seven adults are
randomly selected. Find the probability that fewer than three of the selected adults watch prime-time live.
A:
Binomcdf
Q:
A company has 125 personal computers. The probability that any one of them will require
repair on a given day is 0.025. To find the probability that exactly 20 of the computers will
require repair on a given day, one will use what type of probabilitydistribution?
A:
Binomial distribution
Q:
A professor receives, on average, 24.7 e-mails from students the day before the midterm
exam. To compute the probability of receiving at least 10 e-mails on such a day, he will use what
type of probability distribution?
A:
Poisson distribution
Q:
In its standardized form, the normal distribution has which of the following properties?
A:
Mean of 0, and standard deviation of 1
Qualitative and Quantitative:
Qualitative:
-
Categorical
-
Nominal
-
Ordinal
Nominal:
-
Can only be classified
Ordinal:
-
Can only be classified and ordered
