Question

an urn has 22 balls that are identical except that 7 are
white, 8 are red, and 7 are blue. what is the probability that all
are white if 4 are selected randomly without replacement?

Answer #1

An urn has 16 balls that are identical except that 8 are white
and 8 are red. A sample of 9 is selected randomly without
replacement.
What is the probability that exactly 7 are white and 2 are
red?
What is the probability that at least 7 of the balls are
white?

An urn has 9 balls that are identical except that 6 are white
and 3 are red. A sample of 7 is selected randomly without
replacement.
What is the probability that exactly 5 are white and 2 are
red?
What is the probability that at least 5 of the balls are
white?

An urn has 6 balls that are identical except that 3 are white
and 3 are red. A sample of 4 is selected randomly without
replacement. A) What is the probability that exactly 2 are white
and 2 are red? B) What is the probability that at least 2 of the
balls are white?

Suppose that an urn contains 8 red balls and 4
white balls. We draw 2 balls
from the urn without replacement.
Now suppose that the balls have
different weights, with each red ball having weight
r and each white ball having weight w. Suppose that the
probability that a given ball in
the urn is the next one selected is its weight divided by the
sum of the weights of all
balls currently in the urn.
Now what is the...

An urn contains 3 white balls and 7 red balls. A second urn
contains 7 white balls and 3 red balls. An urn is selected, and the
probability of selecting the first urn is 0.2. A ball is drawn from
the selected urn and replaced. Then another ball is drawn and
replaced from the same urn. If both balls are white, what are the
following probabilities? (Round your answers to three decimal
places.)
(a) the probability that the urn selected...

An urn contains 8 white balls and 4 red balls. The experiment
consists of drawing 2 balls at random from the urn without
replacement.
a) What is the probability that both will be the same color?
b) Same question for part A, but with replacement.

An urn has 12 balls. 8 are white balls and 4 are black
balls.
If we draw a sample of 3 balls (i.e., picking without
replacement) and given that the first two balls selected were a
black ball and a white ball, what is the conditional probability of
the third ball drawn being white?

There are 8 black balls and 7 red balls in an urn. If 4 balls
are drawn without replacement, what is the probability that no more
than 1 black ball is drawn? Express your answer as a fraction or a
decimal number rounded to four decimal places.

An urn contains 2 white balls, 3 red balls, and 5 blue balls.
You draw 3 balls (all at once) from the urn. What is the
probability that they are all blue?

Two balls are drawn without replacement from an urn with 5 red,
3 white, 6 blue balls. Find the number of ways for selecting two
balls:
a). with the same
color
b). with different colors
c). 1 red, 1
white
d). red or white

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