Probability and Statistics Quiz with Answers

Question 1

Find the median of the data set $9,\ 3,\ 5,\ 1,\ 7$.

Accepted Answer

$5$

Answer

$\frac{1+9}{2}=5$

Answer

$3$

Answer

$7$

Question 2

A die is rolled. Let $A$ be “roll an even number” and $B$ be “roll a number greater than 4.” What is $P(A\cap B)$?

Accepted Answer

$\frac{1}{6}$

Answer

$\frac{1}{3}$

Answer

$\frac{1}{2}$

Answer

$\frac{5}{6}$

Question 3

In a normal distribution, approximately what percentage of data lies within **1 standard deviation** of the mean?

Accepted Answer

About $68\%$

Answer

About $99.7\%$

Answer

About $95\%$

Answer

About $50\%$

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