Maths : Practice Questions and Answers

In normal probability distribution for a continuous random variable, the value of a mean deviation is approximately equal to:

In normal distribution:

In a standard normal distribution, the value of mode is:

In a standard normal distribution, the area to the left of Z = 1 is :

In a normal probability distribution of a continuous random variable, the value of standard deviation is:

In a normal distribution, the lower and upper quartiles are equidistant from the mean and are at a distance of:

In a normal distribution whose mean is land standard deviation 0, the value 4 quartile deviation is approximately:

In a normal curve, the ordinate is highest at:

In a normal curve, the highest point on the curve occurs at the mean, μ, which is also the:

In a normal curve μ ± 0.6745σ covers:

If Z~N, then μ4 is equal to:

If Z~N, the coefficient of variation is equal to:

If X~N(100, 64), then standard deviation σ is:

If X is a normal random variable having mean μ, then E|X - μ| is equal to:

If X is a normal random variable having mean μ, then E(X - μ)2 is equal to:

If X ~ N(μ,σ2), the standard normal variate is distributed as:

If X ~ N(μ,σ2), the points of inflection of normal distribution are:

Given a standardized normal distribution (with a mean of zero and a standard deviation of one), P(Z < variance) is equal to:

For the standard normal distribution, P(Z > mean) is:

A random variable X is normally distributed with μ = 70 and σ2 = 25. The third moment about arithmetic mean is: