3. In a study to reveal the relation between IQ and depression, it was established that 25% of the adult population suffers from depration and those who are depressed have an average IQ of 105 which is normally distributed with a standard deviation of 15 points. (a) If a random sample of 60 persons from the poulation is picked, what is the probability that at least 24 of them suffer from depression? (b) If a random sample of 10 persons is picked, what is the probability that at most, only 1 of them suffers from depression? (c) If a random sample of 100 depressed individuals is picked, what is the probability that their average IQ is more than 110?

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Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.