Answer:

Step-by-step explanation:

I think its B)55
i hope it helps
The numbers are 15, 17 and 19
The probability that all marbles are yellow is
(7/20) (7/20) (7/20) = 343/8000
We are given
x = 2 and 3
u = 2.5
s = 0.5
Getting the z score
z = (2 - 2.5) / 0.5 and (3 - 2.5)/ 0.5
z = -1 and 1
The percentage is
1 - 0.1557 = 81.5%
Answer:
X = -1
Step-by-step explanation:
In pic
(hope this helps can I pls have brainlist (crown) ☺️)