CK12 - Geometry

Nabeel’s companyhas holidayseachyear. Holidaysare alwayson weekdays(not weekends).This

year thereare weekdays.Whatis the probabilitythat any weekdayis a holiday?

Thereare weekdaysin all.

of the weekdaysare holidays

Comments:Probabilitiesare oftenexpressedas fractions,decimals,and percents.Nabeelcan say that

thereis a chanceof any weekdaybeinga holiday. Notethat this is (unfortunately?)a relativelylow
probability.

Example 2

Charmanehas four coinsin a jar: two nickels,a dime,and a quarter. She mixesthemwell. Charmanetakes
out two of the coinswithoutlooking.Whatis the probabilitythat the coinsshe takeshavea total valueof

morethan?

in this problemis the total numberof two-coincombinations.We can just list themall. To makeit easy

to keeptrack,use thesecodes: (one of the nickels), (the othernickel), (the dime),and (the
quarter).

Two-coincombinations:

Thereare six two-coincombinations.

Of the six two-coincombinations,threehavea total valueof morethan. Theyare:

The probability that the two coins will have a total value of more than is

.