Question 1189291
Let x be the number of heads which occur when a coin is tossed 100 times.
Find P(45 < X < 55) 
<pre>
&mu; = np = (100)(0.5) = 50
&sigma; = √(npq) = √(100*0.5*0.5) = √25 = 5

Use TI-84

normalcdf(45,55,50,5)

Answer: 0.6826894809

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Let Y be the number of ones which occur when a die is rolled 300 times
Find P(45 < X < 55) 
<pre>
&mu; = np = (300)(1/6) = 50
&sigma; = √(npq) = √(300*(1/6)*(5/6)) = √41.66666667 = 6.454972244

Use TI-84

normalcdf(45,55,50,6.454972244)

Answer: 0.5614221135

Edwin</pre>