Question

Suppose in a microarray experiment, there are 140 genes under consideration, and only 90 genes out of the 140 genes are expressed. Let X be the number of expressed genes out of six randomly genes.

Is this a binomial or Hypergeometric distribution?

Find the probability that only three of the six genes selected will be expressed.

Answer #1

Suppose in a microarray experiment, there are 140 genes under
consideration, and only 90 genes out of the 140 genes are
expressed. Let X be the number of expressed genes out of six
randomly genes.
A. Give the probability distribution of X and its parameters.
Use this distribution to answer both B and C.
B. Find the probability that only three of the six genes
selected will be expressed.
C. Find the probability that all genes selected will be
expressed.

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2
3
4
5
6
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σ2 =
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