Question # 1: A Maintenance Manager has recorded the time taken by Maintenance staff to repair a particular type of equipment fault. The following table shows the time taken in Minutes to repair 250 recent faults. Time taken (Mİnutes) Frequency Under 10 28 10 and under 20 54 20 and under 30 81 30 and under 40 57 40 and under 50 23 50 and under 60 7 60 and over (G) Calculate the Mean and standard deviation of the time taken (b) Calculate the coefficient of variation.

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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.