Probability Density Curves

It is a variable whose value is determined by chance

• random variable

• discrete variable

• continuous variable

• sampling variable

which is true statement about discrete probability distribution?

• The sum of the probabilities must be greater than 1

• The sum of each value of the random variable must be between 1 and 2

• it consists of the values a random variable can assume and the corresponding probabilities of the values

• Random variables can only one value

what is the other term for discrete probability distribution?

• Probability of discrete function

• Probability of universal function

• Probability of identity function

• Probability mass function

The following describe a normal curve, which is NOT?

• The curve is symmetrical about its center

• The distribution curve is bell shaped

• The width of the curve is determined by the mean of the distribution

• The mean, median and mode coincide at the center

In a normal distribution, the mean is always equal to

• 0

• 1

• 2

• 1/2

The tails of the normal curve flatten out indefinitely approaching but never touching along the horizontal axis, which statement best describes a normal curve?

• The curve is symmetrical to the baseline

• The curve is parallel to the baseline

• The curve is approaching the x- axis

• The curve is asymptotic to the horizontal axis

It can be constructed for a probability distribution by plotting the values of the random variable along the horizontal axis and plotting the probabilities along the vertical axis

• normal curve

• Distribution curve

• Histogram

• Chart

Which of the following is not true of the normal distribution

• The curve is bell shape

• The curve approaches the x-axis gradually on either side of the mean

• The distribution is symmetrical about the vertical line drawn from the peak of the curve

• The curve is symmetrical