8. The lengths of rods from a certain factory are normally distributed with mean uem and standard deviation 6cm. It is known that 4.78% of the rods have lengths greater than 82em. Find to the nearest integer. (i). the mean u. (ii) the range, a (symmetrical about the mean) within which 75% of the lengths of the rods lie. F'ind also, to 4 decimal places
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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Answer i, ii, iii,
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