Statistics and Probability 2nd Sem Q1 week 3

It is the measure of central location of a random variable and sometimes called the expected value or expectation.

• mean

• variance

• standard deviation

• variance

Tags

CCSS.HSS.MD.A.2

Which symbol represents "mean of probability distribution"?

• Σ

• σ

• μ

• ⍺

It describes the amount of spread, dispersion or variability of the item in a distribution.

• mean

• variance

• median

• frequency

Tags

CCSS.6.SP.A.3

The variance of discrete probability distribution is given by the formula __________.

• $\sqrt{\Sigma x^2\cdot P\left(x\right)-\mu^2}$

• $\Sigma x\cdot P\left(x\right)-\mu^2$

• $\Sigma\left[x^2\cdot P\left(x\right)\right]-\mu$

Which of the following does not belong to the steps in finding the variance of probability distribution in a random variable?

• find the mean of the probability distribution

• add the mean from each value of a random variable x

• square the results of the difference between mean and random variable x

• multiply the results obtained in squaring the difference between mean and random variable x by the corresponding probability