Degrees of freedom:
a) is something that certain undergraduate majors at your university/college other than economics seem to have an [infinity] amount of.
b) in the context of the sample variance formula means that estimating the mean uses up some of the information in the data.
c) ensure that s^2y = σ^ 2y .
d ) are (n-2) when replacing the population mean by the sample mean.

4

step-by-step explanation:

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.

1,150 give brainliest

step-by-step explanation

2r= 2300

r =1150