Question 194383
a)
Let x=.6 and y=.4 (not recovered within 1 week)
Now we expand the binomial (x+y)^10 an take the 1st four terms:
x^10=.0060
10x^9y=.0403
45x^8y^2=.1209
120x^7y^3=.2150
Sum of probabilities: .3823
.
b)
nCr best to find the number in front of the 15th term.
25C15=3268760
3268760x^15y^10=.1612
.
Ed