42% of adults say cashews are their favorite kind of nut. You randomly selected 12 adults and ask each to name his or her favorite nut. Find the probability that the number who say cashews are their favorite nut is
(a) exactly three,
On your TI-84
PRESS ON
PRESS CLEAR
PRESS 2ND
PRESS VARS
PRESS ALPHA
PRESS MATH
You should see ---> binompdf(∎
(The ∎ means a blinking cursor)
At the blinking cursor type 12,.42,3)
You should see this on your screen:
binompdf(12,.42,
3)
Press ENTER
read .1210660838, to nearest thousandths, .121
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(b) at least four
PRESS ON
PRESS CLEAR
Type this: 1- <--- that's "ONE MINUS"
PRESS 2ND
PRESS VARS
Scroll down to B:binomcdf(
PRESS ENTER
You should see ---> 1-binomcdf(∎
(The ∎ means a blinking cursor)
At the blinking cursor type 12,.42,3)
You should see this on your screen:
1-binompdf(12,.4
2,3)
Press ENTER
read .8147354733, to nearest thousandths, .815
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(c) at most two.
PRESS ON
PRESS CLEAR
PRESS 2ND
PRESS VARS
Scroll down to B:binomcdf(
PRESS ENTER
You should see ---> binomcdf(∎
(The ∎ means a blinking cursor)
At the blinking cursor type 12,.42,2)
You should see this on your screen:
binompdf(12,.42,
2)
Press ENTER
read .0641984429, to nearest thousandths, .064.
Edwin
