2) The factory workers in Dilovası are prone to a disease called Pneumonia. In a recent survey in a workplace in Dilovası, about (10+1)% of the employees have been infected by it. Presume the same portion (rate) holds nationwide. Use the normal distribution and approximate the probability, out of a random sample of 450 workers, the number of workers that are prone to disease at present will be (a) 30 or more; (b) 28 or less.
Permutations and Combinations
If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.
Counting Theory
The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.
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