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Pop Quiz 12.5 (A2)

Authored by Kenneth Eaves

Mathematics

University

Used 4+ times

Pop Quiz 12.5 (A2)
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9 questions

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1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Given the probability model in the table below, what is the expected value of the random variable?
  X        50          20        5
P(X)     0.1         0.3      0.6

14
4.67
5
7.5

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the expected value is negative, are you expected to win?

yes
no

3.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

A coin is flipped 3 times. If you get tails once you get $5, tails twice you get $15, and tails on all three flips you get $40. What is the expected amount of money you will get?

$12.50
$5
$7.50
$10

4.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Eva flips a coin. If she gets heads, she wins $4. If she gets tails, she loses $3. What is her expected value of a coin flip?

$1

$0.50

-$0.50

$0

5.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Suppose you buy a ticket for $6 out of a lottery of 1000 tickets where the prize for the one winning is to be $800. How much money do you take home (after paying for it)?

$800

-$6.50

-$6

-$5.20

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A fair, 6-sided dice is thrown 18 times.

Roughly how many times would you expect the number 6 to come up?

1

3

6

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A box contains 12 red, 20 green and 8 yellow sweets.

One is picked out at random then placed back 80 times.

Roughly how many times would you expect him to pick up a yellow sweet?

8

12

16

24

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