Which describes a uniform probability model?

Question

Responses
A drawing a red or black card from a deck of cards
B selecting a sock from 5 black socks and 10 white socks
C selecting a ball from 2 red balls and 3 yellow balls
D equally divided five section spinner with three colors

Answer 1

D - equally divided five section spinner with three colors.

Answer 2

A bag contains 6 red marbles, 6 purple marbles, and 6 yellow marbles. What is the probability of randomly selecting a yellow marble from the bag?

Answer 3

There are a total of 6 + 6 + 6 = 18 marbles in the bag. The probability of randomly selecting a yellow marble is the number of yellow marbles divided by the total number of marbles:

P(yellow) = 6/18 = 1/3

Therefore, the probability of randomly selecting a yellow marble is 1/3.

Answer 4

Student Grade
Arthur 7
Jeff 8
Anna 7
Molly 8
Sara 8
Bryan 7
Joseph 8
Michael 7
Susan 8
Maria 7

Mrs. Benton selects one student's work to display on a bulletin board each week. Each student's name is placed in a bag from which Mrs. Benton draws a name. What is the probability that an eighth grade student will NOT be selected?

Answer 5

There are 10 students in total, 4 of whom are in eighth grade. Therefore, the probability of selecting an eighth grade student is:

P(eighth grade) = 4/10 = 2/5

The probability of not selecting an eighth grade student is equal to 1 minus the probability of selecting an eighth grade student:

P(not eighth grade) = 1 - P(eighth grade)
P(not eighth grade) = 1 - 2/5
P(not eighth grade) = 3/5

Therefore, the probability that an eighth grade student will not be selected is 3/5 or 0.6.