Question
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How would I find the attached probabilities?

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Step 1

It is given that 80% of all marketing personnel are extraverts and 55% of all computer programmers are introverts.

Step 2

There are 80% of all marketing personnel are extraverts and 15 marketing personnel.

The binomial distribution can be used to find the following probabilities:

a).

At a meeting of 15 marketing personnel, then probability that 10 or more are extroverts is calculated below:

Excel formula =1–BINOM.DIST (9,15,0.8,TRUE)

From the above output, the probability that 10 or more are extroverts is 0.938

Step 3

The probability that 5 or more are extroverts is as follows:

Excel formula =1–BINOM.DIST (4,15,0....

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