3. The mass of coffee in a randomly chosen jar sold by a certain company may be taken to have a normal distribution with means 203 g and standard deviation 2.5g. (i) Find the probability that a randomly selected jar will contain at least 200g of coffee. (ii) Obtain the probability that two randomly selected jars will together contain between 400g and 405g of coffee. The random variable C denotes the mean mass (in grams) of coffee per jar in a random (iii) sample of 20 jars. Identify the value of a such that P(C - 203 < a) = 0.95.

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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.