D Supplementary Exercise 4.3 1. The mean score of a random sample of 22 student applicants who took the college entrance examination is calculated to be 76.9. The population variance is known to be 274. Find the 99% confidence interval for the mean of the entire student applicants.

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Ratios

A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.

Trigonometric Ratios

Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.