The Following Table Shows Part of the Probability Distribution for the Number

question 20

Short Answer

The following table shows part of the probability distribution for the number of boats sold daily at Boats Unlimited. It is known that the average number of boats sold daily is 1.57.
$$\begin{array} { c c } x & \text { fx) } \\0 & 0.20 \\1 & 0.30 \\2 & 0.32 \\3 & ? \\4 & 0.05 \\5 & 0.02\end{array}$$ Compute the variance and the standard deviation for this probability distribution.

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Definitions:

OID

Original Issue Discount; it refers to the difference between the original issue price of a bond and its maturity value, treated as interest for tax purposes.

Series I Savings Bonds

A type of U.S. savings bond designed to protect the value of your cash from inflation.

Qualified Higher Education Expenses

Expenses required for enrollment or attendance at an eligible educational institution, including tuition, fees, books, supplies, and equipment.

AGI

This refers to the measure of income calculated from your gross income and used to determine how much of your income is taxable.