Question

which table is a probability distribution table?
A) x: 1 2 3 4
p: 0.1 |0.45 |0.3 |0.15

B) x: 1 2 3 4
p: 0.35| 0.2| 0.25| 0.3

C) x: 1 2 3 4
p: -0.25| 0.05|0.35|-0.4

D) x: 1 2 3 4
P: 0 | 0.15| 0.25|1.2

Answer 1

hint:

all the probabilities must be positive and they must add up to exactly 1

Answer 2

which one matches this description?

Answer 3

A ?? o:

Answer 4

good job! a is the answer

Answer 5

Ah thank you so much!!! <3 <3
I have one more question, could u teach me the steps for this one as well?

eight people audition for a choir. The choir director must choose one soprano, one alto, and one tenor. In how many ways can the director fill these positions? A) 56 B) 336 C) 6720 D) 40,320

Answer 6

first, we choose a soprano.

there are 8 people, so there are 8 possibilities for a soprano

then, after we choose the soprano, there are only 7 people left

with me so far?

Answer 7

Yeah

Answer 8

so for the alto we only have 7 choices

after we choose the alto we have 6 people left

with me so far?

Answer 9

yeah, the number of people is decreasing because people are being picked out, so after the alto we have 6 and then after choosing the tenor we're left with 5.

Answer 10

correct

so our answer is

8 * 7 * 6 = 336

Answer 11

Oooh i see !! omgg thank you so much ah! <3 <3 You've been great help!