Answer:
c. 4.27
Step-by-step explanation:
We have been given the regression equation of for predicting number of speeding tickets (Y) from information about driver age (X) as .
To find the predicted number of tickets for a twenty-year-old, we will substitute in our given equation.
Therefore, the predicted number of tickets for a twenty-year-old would be 4.27 tickets.
Answer:
a) How many social security cards can be issued with no repeated digits?
We have 10 numbers from 0 to 9. When no digit is repeated, so we get 10! ways that is =
= 3628800
b) How many social security cards that can be issued with at least one digit repeated?
We will get this by subtracting 10! from all possible cases.
=
Exercise 4.
a) How many nonempty subsets are in a set of 5 elements?
Each element has 2 choices that are either selected in subset or not selected in subset.
Here, total choices will be
And it is 1 time that no element is selected.
So, the number of non empty subsets will be =
=>
b) Erika has 5 friends. In how many ways can she invite one or more friends to a dinner party?
Same like above part, here Erika has two choices for each friend, either invite or not invite.
So, she has total choices.
1 way to not invite anyone.
Hence, the number of ways can she invite one or more friends to a dinner party = ways.