0
Still curious? Ask our experts.
Chat with our AI personalities
Ross
Rafa
BeauAdd your answer:
Earn +20 pts
Can you please tell me the variance and the standard deviation for n equals 80 and p equals 0.3?
For a binomial probability distribution, the variance is n*p*q which is 80*.3*.7 = 16.8. The standard deviation is square root of the variance which is 4.099; rounded is 4.1. The mean for a binomial probability distribution is n*p or 80*.3 or 24.
If the mean of a normal distribution is negative what is the varience?
The variance is always positive. The variance is not directly related to the sign (nor magnitude) of the mean.
Can the variance of a normally distributed random variable be negative?
No. The variance of any distribution is the sum of the squares of the deviation from the mean. Since the square of the deviation is essentially the square of the absolute value of the deviation, that means the variance is always positive, be the distribution normal, poisson, or other.
Which distribution function has equal mean and variance?
The exponential distribution and the Poisson distribution.
What is the variance for the uniform random variable?
the variance of the uniform distribution is (a+b)/12
