Practice for contingency tables and time problems

_____________Male____Female__row totals
Facebook______55________________125
no Facebook __________20_____   ______
col. totals___90_____________________grand total

Answer the following probability problems from the completed contingency table. Write the answers first as fractions then rounded to the nearest thousandth.

The inclusion exclusion rule tells us p(A UNION B) = p(A) + p(B) - p(A INTERSECTION B) 

p(Facebook) = _________ ~= __________

p(Male) = _________ ~= __________

p(Male INTERSECTION Facebook) = _________ ~= __________

p(Male UNION Facebook) = _________ ~= __________

Time problems.

a) How many minutes in 3 days?

b) 560 hours is __________ days and ________ hours.


c) 8,086 seconds is ________ hours, ________ minutes and __________ seconds.

d) 8,086 hours is ________ weeks, ________days and __________ hours.

e) After a flu outbreak, a hospital has decided quarantine will last 66 hours. If it starts at 5:00 pm on Tuesday, give the day and time when it will be over.

Day: ________ time: ___________ a.m or p.m? __________

Answers in the comments.
 

Practice problems for first homework of Summer 2012

Change these numbers in Hindu-Arabic to Roman numerals.

648 = ______

15,781 = _____

Change these numbers in Roman numerals to Hindu-Arabic.
__
IXCDXLVII = ____

DCXCIV = ____

Find the approximation of 7/37 to the following number of decimal places and find the exact repeating decimal representation.

7/37 to the nearest tenth = _____
7/37 to the nearest hundredth = _____
7/37 to the nearest thousandth = ____

Repeating decimal representation = _____

Find the prime factorization of 48.

Find all the factors of 48.

Add or subtract these times, given in minutes and seconds.  If the minutes are 60 or more, change the answer to hours:minutes:seconds.

27:25 + 18:58 + 21:44 = __________

17:21 - 9:46 = __________

Answers in the comments.

Time conversions

Change 12,345 seconds into hours, minutes and seconds.

Change 1,776 minutes into days, hours and minutes.

Answers in the comments.