corrected question:A jar contains two blue and five green marbles. A marble is drawn at random and then replaced. A second marble drawn at random. For each of the following, find the probability that: a) both marbles are blue b) both marbles are the same color c)the marbles are different in color

Answer:

Step-by-step explanation:

The probability was done with replacement.

Probaility of an event happening $=\frac{number of required outcomes}{number of possible outcomes}$

number of blue marbles= 2

number of green marbles=5

total number of marbles=7

(a) probability that both marbles are blue = pr(first is blue)*pr(second is blue)

$=\frac{2}{7}*\frac{2}{7}$

$=\frac{4}{49}$

(b)probability that both marbles are the same color =pr(first is blue)*pr(second is blue) + Pr(first is green)*Pr(second is green)

$=\frac{4}{49} + \frac{5}{7}*\frac{5}{7}$

$=\frac{4}{49} + \frac{25}{49}$

$=\frac{29}{49}$

(c)Probability that the marbles are different in colors=pr(first is blue)*pr(second is green) + Pr(first is green)*Pr(second is blue)

$=\frac{2}{7}*\frac{5}{7}+ \frac{5}{7}*\frac{2}{7}$

$=\frac{10}{49}+\frac{10}{49}$

$=\frac{20}{49}$

6 0

3 years ago

If you flip three fair coins, what is the probability that you'll get all three tails?

vivado [14]

Answer:

50%

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

It takes 4 pounds of grapes to make 1 pound of raisins. How many pounds of grapes would you need to make 3000 pounds of raisins?

ryzh [129]

4:1
(grapes);(rasins)

4:1
x:3000
so you then cross multiply
1·x=4·3000
multiply,
x=12000

so the answer is it takes 12000 pounds of grapes to make 3000 pounds of raisins

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3 years ago

Mariana adoçou um suco com 1/4 de xícara de açúcar. Ao experimentar percebeu que não estava doce como gostaria e acrescentou mai

icang [17]

Answer: B 1/4 doc. de açúcar.

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3 years ago