In: Statistics and Probability
A manufacturer knows that their items have a normally
distributed lifespan, with a mean of 10.3 years, and standard
deviation of 2.4 years.
If you randomly purchase one item, what is the probability it will
last longer than 7 years? (Give answer to 4 decimal places.)
A particular fruit's weights are normally distributed, with a
mean of 645 grams and a standard deviation of 18 grams.
The heaviest 13% of fruits weigh more than how many grams?
Give your answer to the nearest gram.
Suppose that 59% of people own dogs. If you pick two people at
random, what is the probability that they both own a dog?
(Give your answer as a fraction or decimal rounded to 3 places)
About 9% of the population has a particular genetic mutation.
1000 people are randomly selected.
Find the mean for the number of people with the genetic mutation in
such groups of 1000. (Remember that means should be rounded to one
more decimal place than the raw data.)