The following are the characteristic of normal distribution except: (a) The norm

Question

The following are the characteristic of normal distribution except: (a) The normal curve is a bell shaped curve. It is symmetrical about the line x= mu (b) The mean median mode are all centrally located and are equal (c) The following area properties hold: mu notequalto alpha = 0.6826, mu plusminus 2 alpha = 0.9544, mu plusminus 3 alpha = 0.9973(d) The normal curve runs from -infinity to infinity. (e) The distribution can be applied to find the probability of x number of successes out of n trials. Suppose that the systolic blood pressure of male adults is normally distributed with a mean of 125 and a standard deviation of 15 (measured in appropriate units). The interval in which the blood pressures of 68% of the population will fall: (a) 95 and 140 (b) 80 and 140 (c) 80 and 170(d) 110 and 140 (e) 150 and 190

Explanation / Answer

Question 1: The mean median and mode might not be equal in case of all normal distributions . Only standard normal distribution satisfies this property. Answer is B

Question 2, for 68% confidence, we look at one standard deviation away from the mean. Thus correct answer should be mean-std and mean+std . 125-15= 110 and 125+15= 140

Correct answer is D

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