Question

Please help.. medall..

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
D. = 3/7

Answer 1

@iceicebaby @mathpapa @mathstudent55 please help

Answer 2

Please help if you can..

Answer 3

to find the probability you want to divide the # black marbles by # total
marbles

Answer 4

Ok 1 sec.

Answer 5

1.5

Answer 6

sorry my first answer was a typo

Answer 7

the denominator should be the (# total marbles = 20+30)

Answer 8

ok so 50

Answer 9

yes

Answer 10

Then what..

Answer 11

the formula is (#black)/(#total)

Answer 12

30/50

Answer 13

then simplify

Answer 14

Ok so you have to simplify

Answer 15

yes

Answer 16

I got B as the answer.?

Answer 17

looks good to me

Answer 18

Thank you i will call you if i need help cause i have 4 more you explain that so well thank you.

Answer 19

cool, good luck w it

Answer 20

Thank you.

Answer 21

you're welcome :)

Answer 22

Are you still here cause i need help.with another one

Answer 23

ok let's do one more

Answer 24

Ok 1 sec.

Answer 25

The table shows the results of a spinner with four colored sections. Use the table to answer the question.

The spinner is spun 50 more times.

Which is the best prediction for the number of times the spinner will stop on white?



A.
5

B.
10

C.
25

D.
40

http://static.k12.com/calms_media/media/1416500_1417000/1416594/1/4a6a128174ef4cce8333d1b7887f0e5c9ae95554/FGA_130913_160910.jpg

Answer 26

cool. first, can you find the probability that it is white

Answer 27

remember the formula: (#white)/(#total)

Answer 28

Ok.

Answer 29

So add them all up then divide white by it.

Answer 30

ya, what does that calculate to

Answer 31

0.49

Answer 32

So its D.

Answer 33

Cause you have to estimate/guess close to it.

Answer 34

once you have the probability, then you need to multiply by 50

Answer 35

because you're gonna spin it 50 times

Answer 36

.49*50

Answer 37

(probability)*(total spins) = (# of expected spins)

Answer 38

.49*50 = 24.5

Answer 39

so pick the one closest to 24.5

Answer 40

does that make sense?

Answer 41

C. 25 looks like the closest