C) At the end of the day, the records show that 140 customers made a purchase at the store that day. What are the mean and standard deviation of the number of customers who won a discount of at
least 30%?

The right solution is "5.92". A further solution is provided below.

Explanation:

The given values are:

Total number of customer,

n = 140

The probability of 30% discount,

=

Somewhat by binomial distribution we could perhaps calculate the mean as well as the mean of the standard deviation will be:

=

=

Now,

The standard deviation will be:

=

On substituting the given values, we get

=

=

=

=

answer; police ethics;

the answer to the question is

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