Khlara
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Khlara:
Group Title
Last year, there were 30,000 students at a university; their GPA had a mean of 2.9 and an SD of 0.6. This year, in a simple random sample of…
 updated one year ago
 No Medals Yet
Mathematics

Khlara:
Group Title
A class has 3 Teaching Assistants (TAs). Each TA tosses a coin 10 times. Find the chance that at least one of the TAs gets exactly 5 heads.
…
 updated one year ago
 103 replies
 2 Medals
Mathematics

Khlara:
Group Title
I roll a die repeatedly. Find the chance that the first 4 rolls all show different faces, and the 5th roll shows a face that has appeared be…
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

Khlara:
Group Title
A quiz consists of 20 truefalse questions. The score for each question is 1 point if it is answered correctly, and 0 otherwise.Suppose a st…
 updated one year ago
 1 reply
 1 Medal
Mathematics

Khlara:
Group Title
A box contains 8 dark chocolates, 8 white chocolates, and 8 milk chocolates. I choose chocolates at random (yes, without replacement; I’m ea…
 updated one year ago
 9 replies
 No Medals Yet
Mathematics

Khlara:
Group Title
I throw darts repeatedly. Assume that on each throw I have a 1% chance of hitting the bullseye, independently of all other throws. (Note tha…
 updated one year ago
 4 replies
 1 Medal
Mathematics

Khlara:
Group Title
A die is rolled 12 times. Find the chance that the face with six spots appears once among the first 6 rolls, and once among the next 6 rolls…
 updated one year ago
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Mathematics

Khlara:
Group Title
A person is selected at random from a population that has the following characteristics: 65% of the people are men; the others are women 12%…
 updated one year ago
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Mathematics

Khlara:
Group Title
A poker hand (5 cards) is dealt. Find the chance that the cards are all of the same suit. [This is sometimes called a “flush.”]
 updated one year ago
 3 replies
 1 Medal
Mathematics

Khlara:
Group Title
There are 26 letters in the English alphabet. Letters are picked one by one at random, so that each letter has the same chance of appearing …
 updated one year ago
 2 replies
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Mathematics

Khlara:
Group Title
A quiz consists of 10 questions. Each question is marked either “right” or “wrong.” For each student in the class, the instructor keeps a re…
 updated one year ago
 5 replies
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Mathematics