The P/E ratio or "ratio to earnings" ratio of a company is a measure of the price of its stock compared to its profits.

Low P/E ratios tend to indicate low-growth companies while high P/E ratios tend to indicate high-growth companies. A random sample of 51 large companies found a sample mean P/E ratio of 25.2 with a sample standard deviation of 16.2. Estimate the P/E ratio of all large companies with a margin of error at the 95% confidence level, to the nearest tenth.