Resources

Resources

Bytelearn - cat image with glasses

AI tutor

Welcome to Bytelearn!

Let’s check out your problem:

There are 12 counters in a bag.
3 of the counters are red
9 of the counters are green
Ameya, Jack and Ella each take at random one counter from the bag.
Work out the probability that at least one red counter is still in the bag.

There are $12$ counters in a bag. $\newline$ $3$ of the counters are red $\newline$ $9$ of the counters are green $\newline$ Ameya, Jack and Ella each take at random one counter from the bag. $\newline$ Work out the probability that at least one red counter is still in the bag.

View step-by-step help

View step-by-step help

Make predictions

Full solution

Q. There are

12

counters in a bag.

\newline

3

of the counters are red

\newline

9

of the counters are green

\newline

Ameya, Jack and Ella each take at random one counter from the bag.

\newline

Work out the probability that at least one red counter is still in the bag.

Question Prompt: question_prompt: What's the probability that at least one red counter is left in the bag after Ameya, Jack, and Ella each take one?
Total Counters: Total counters in the bag: $12$ . Red counters: $3$ . Green counters: $9$ .
Probability for Ameya: Probability that the first person (Ameya) does not take a red counter: $9$ green counters / $12$ total counters = $\frac{3}{4}$ .
Probability for Jack: After Ameya's turn, if no red counter is taken, there are $11$ counters left with $3$ red and $8$ green. Probability that the second person (Jack) does not take a red counter: $8$ green counters / $11$ total counters.
Probability for Ella: Probability calculation for Jack: $\frac{8}{11}$ .
Calculation for At Least One Red Counter: If Jack also doesn't take a red counter, there are now $10$ counters left with $3$ red and $7$ green. Probability that the third person (Ella) does not take a red counter: $\frac{7 \text{ green counters}}{10 \text{ total counters}}$ .
Combined Probability Calculation: Probability calculation for Ella: $\frac{7}{10}$ .
Calculation Error: To find the probability that at least one red counter is left, we calculate the probability that no red counters are taken and subtract it from $1$ .
Calculation Error: To find the probability that at least one red counter is left, we calculate the probability that no red counters are taken and subtract it from $1$ . Combined probability that no red counters are taken by any of the three people: $(\frac{3}{4}) \times (\frac{8}{11}) \times (\frac{7}{10})$ .
Calculation Error: To find the probability that at least one red counter is left, we calculate the probability that no red counters are taken and subtract it from $1$ . Combined probability that no red counters are taken by any of the three people: $(\frac{3}{4}) \times (\frac{8}{11}) \times (\frac{7}{10})$ . Calculation error: The combined probability should be $(\frac{9}{12}) \times (\frac{8}{11}) \times (\frac{7}{10})$ , not $(\frac{3}{4}) \times (\frac{8}{11}) \times (\frac{7}{10})$ .

More problems from Make predictions

Question

6

-sided die two times. What is the probability of rolling a number greater than \(3\) and then rolling a number less than \(4\)? Write your answer as a percentage.

\newline

Posted 5 months ago

Question

9

college students running for student government class president. The candidates include

7

education majors.

\newline

6

of the candidates are randomly chosen to give the first

6

speeches, what is the probability that all of them are education majors?

\newline

Write your answer as a decimal rounded to four decimal places.

Posted 8 months ago

Question

In an experiment, the probability that event

A

\frac{2}{7}

, the probability that event

B

\frac{7}{9}

, and the probability that events

A

B

\frac{1}{9}

\newline

A

B

independent events?

\newline

\newline

\text{yes}

\newline

\text{no}

Posted 8 months ago

Question

At a science museum, visitors can compete to see who has a faster reaction time. Competitors watch a red screen, and the moment they see it turn from red to green, they push a button. The machine records their reaction times and also asks competitors to report their gender.

\newline

The probability that a competitor reacted in over

0.7

0.6

, the probability that a competitor was female is

0.4

, and the probability that a competitor reacted in over

0.7

seconds and was female is

0.3

\newline

What is the probability that a randomly chosen competitor reacted in over

0.7

seconds or was female?

\newline

Write your answer as a whole number, decimal, or simplified fraction.

\newline

Posted 8 months ago

Question

A restaurant server claims that \(28\)% of the time he leaves candy with the bill, the customer tips well.

\newline

If the server's claim is true, and one day he leaves candy with \(4\) customers' bills, what is the probability that exactly \(3\) of those customers will tip well?

\newline

Write your answer as a decimal rounded to the nearest thousandth.

Posted 7 months ago

Question

There is a spinner with `50` equally likely sections, numbered from `1` to `50`. You have the opportunity to spin it. If the number is odd, you win $`11`. If the number is even, you win nothing. If you play the game, what is the expected payoff?\(\$\)_____

Posted 8 months ago

Question

There are two different raffles you can enter.

\newline

In raffle A, one ticket will win a `$720` prize, and the other tickets will win nothing. There are

1,000

in the raffle, each costing `$11`.

\newline

Raffle B is for a `$370` prize. Out of

125

tickets, each costing `$5`, one ticket will win the prize, and the other tickets will win nothing.

\newline

Which raffle is a better deal?

\newline

\newline

\text{[A]Raffle A}

\newline

\text{[B]Raffle B}

Posted 8 months ago

Question

X

is a normally distributed random variable with mean

49

and standard deviation

25

\newline

What is the probability that

X

24

74

?

\newline

0.68-0.95-0.997

rule and write your answer as a decimal. Round to the nearest thousandth if necessary.

\newline

Posted 8 months ago

Question

X

is a normally distributed random variable with mean

65

and standard deviation

8

\newline

What is the probability that

X

62

68

?

\newline

Write your answer as a decimal rounded to the nearest thousandth.

\newline

Posted 8 months ago

Question

Complete the statement. Round your answer to the nearest thousandth.

\newline

In a population that is normally distributed with mean

43

and standard deviation

3

30\%

of the values are those less than ______.

Posted 8 months ago

Related topics

Algebra - Order of Operations Algebra - Distributive Property `X` and `Y` Axes Geometry - Scalene Triangle Common Multiple Geometry - Quadrant