Unlock access to content

Select one option:

Free of charge

Unlock the chapter "Probabilities from frequency tables"

Unlock access to the solution of problems in this chapter.
Free of charge Price: 5 £

Continue »

Subscribe to OpenProf If you do not get a better grade, you get your money back!

Unlock access to all problems solutions.
Available from 10.75 £ / month.

Continue »

Social networks

OpenProf

Export chapter

Include theory

Include problems

Export chapter

Probabilities from frequency tables

Probabilities from frequency tables problem 1

next problem »

Jack wanted to know if taking coffee at night could really help him sleep less and study more. For several nights, Jack recorded how many cups of coffee he drank at night and how many hours he slept that night.

	6 hours	7 hours
0 cup of coffee	6	4
1 cup of coffee	5	2

What is the probability that a randomly selected night is one when he drank exactly 1 cup of coffee and is one when he slept exactly 6 hours?

main author and content editor: OpenProf website