Stock market indices: a. measure the value of the average bond yield. b. determine the price of stocks in the index by deciding whether companies in the index are doing well or not. c. measure income in an economy and price levels. They are often used as an indication of economic growth. d. are average stock prices for a group of companies meant to measure a section of the stock market.

d. are average stock prices for a group of companies meant to measure a section of the stock market.

Explanation:

Stock indices are used to measure the performance of a basket of securities and helps investors in a particular segment of the financial market make well informed decisions.

The value of the index is an average of the stock of underlying companies that make up the index.

For example the Dow Jones is a stock index made up of 30 large companies.

Investors compute performance by comparing current price level to previous prices.

i'm pretty sure the answer is 60.