Question

Find the experimental probability.

Sheila drew single marbles from a bag, recorded the outcome, and replaced the marble. In 50 draws, Sheila drew 20 white marbles and 30 black marbles. What is the experimental probability that the next marble will be black?


a.2/5

b.3/5

c.2/3

b.3/7

Answer 1

@johnweldon1993

Answer 2

@johnweldon1993

Answer 3

@johnweldon1993

Answer 4

use the frequentist definition of probability:

\[p(E)=\frac{ positive \ samples }{ number \ of \ total \ samples }\]

total in your case is 50, can you guess what are the positive samples in relation to your event?

Answer 5

b ?

Answer 6

yes it's the number of black marbles, so do the ratio and you have your answer

Answer 7

thanks!!lol