Exercise 2 Page 304

When calculating the experimental probability, we are comparing the number of times the event occurs to the number of trials. P=Number of Times the Event Occurs/Number of Trials If we roll a number cube, we can roll six different outcomes. The sum of the frequencies of these outcomes is the total number of trials. Let's add them! 13+16+15+17+19+20= 100 From the chart we can read that 16 times we rolled a 2 and 20 times we rolled a 6. The sum of these two frequencies is the number of times the event occured. 16+20= 36 Now we have enough information to calculate P(rolling a2 or 6).

P=Times the Event Occurs/Number of Trials

SubstituteValues

Substitute values

P(rolling a2 or 6)=36/100

ReduceFrac

a/b=.a /2./.b /2.

P(rolling a2 or 6)=18/50

CalcQuot

Calculate quotient

P(rolling a2 or 6)=0.36

WritePercent

Convert to percent

P(rolling a2 or 6)=36 %

The probability of spinning a 2 or a 6 is 1850, which can also be written as 36 % .