Which of the following is NOT a property of a density curve

Which of the following is NOT a property of a density curve It never goes below the horizontal axis. The chance of the quantity falling between a and b is the area under the curve between the points a and b It is bell-shaped. To completely specify the shape of a normal distribution, you must give the five-number summary the mean and the standard deviation the mean and the median the number of outliers

Solution

1. Answer: C.

For the first problem we must consider that the region below the density curve and above the X axis represents the probability of occurrence of a random event. Now the normal curve never be below the X axis also subsection b) it is correct; subsection c) is not necessarily true, since there are density curves where the bell shape does not occur.

2. Anwer: B.

All you need to define a normal curve is the mean and standard deviation.