Question 930943
n(doc degree) = .80 ,  n = 10
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Using a TI calculator 0r similarly a Casio fx-115 ES plus
P(x < 4)= binomcdf(10, .80, 3) = .00086
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P(x &#8805; 6) = 1 - binomcdf(10, .80, 5)= 1-.0328 = .9672
..........
P(5&#8804; x &#8804; 7) = binomcdf(10, .80, 7) - [ 1- binomcdf(10, .80, 4)]
P(5&#8804; x &#8804; 7) = .3222 - .0064 = .3158
0r
P(5&#8804; x &#8804; 7) = P(x=5) + P(x=6) + P(x=7) = .0264 + .0881 + .2013 = .3158
Using binompdf()  Or for ex P(x=5) = 10C5(.8)^5(.2)^5