A market researcher for a provider of iPod accessories wants to know the proportion of customers who

Question:

A market researcher for a provider of iPod accessories wants to know the proportion of customers who own cars to assess the market for a new iPod car charger. A survey of 500 customers indicates that 76% own cars.
a) What is the standard deviation of the sampling of the proportion?
b) How large would the standard deviation have been if he had surveyed only 125 customers (assuming the proportion is about the same)?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...