The Mean and Variance of a Bernoille Random Variable Are $\sqrt { p ( 1 - p ) }$

question 58

Multiple Choice

The mean and variance of a Bernoille random variable are given as

• A)cannot be calculated
• B)np and np(1-p)
• C)p and \(\sqrt { p ( 1 - p ) }\)
• D)p and (1- p)

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Definitions:

Planetary Gearset

A complex system of gears that includes a central sun gear, multiple planet gears, and an outer ring gear, used in many automatic transmissions.

Sun Gear

The central or axis gear in a planetary gearset. It may be optioned to rotate or not rotate, depending on the gear arrangement and desired output ratios.

Ring Gear

A large gear that meshes with a smaller gear (pinion), often used in the differential of an automobile.

Planetary Gearset

a compact, high-torque gear system where the central gear (sun gear) drives multiple outer gears (planet gears) which in turn drive a ring gear.