A coin is weighted so that it has a 70% chance of landing heads up when flipped. In a sequence of 10 independent flips, let X be the number of flips where the coin lands face up. What type of distribution does X have? Write the probability mass function for X. Find P(X = 6).
[use ti84 calculator]
X ~ Bin (n,p)
Where n = 10 , p = 0.70
Probability ,ass function of X is
P(X) = nCx * pX * ( 1 - p)n-X
P(6) = 10C6 * 0.706 * 0.304
Using TI-84 ,
P(X = 6) = ?
Press 2nd VARS
scroll to binompdf(
[ The syntex is binompdf(n,p,x) ]
Press binompdf(10 , 0.70 , 6)
ENTER
0.2001
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