Assume which 75% of all investment bankers have profited from the use of insider information. And right away pretence which fifteen investment bankers have been comparison during pointless from the commission’s registry.
1) What is the luck which during many 9 as well as some-more than fourteen have profited from insider information?
2) What is the expevted series of investment bankers who have profited from the use of insider information?
3) Find the luck which 2 have profited from insider report since n-12 as well as p=0.1
{ 2 comments… read them below or add one }
no
This is binomial probability.
n=15
p=0.75 — probability that one banker profited from insider information
P(x= 0 to 9) + P(x=15), where x is the number of bankers profited from insider information
P(x=0)+P(x=1)+……+P(x=9) + P(x=15)
P( 0 <= x <= 9) =0.148368
P( x=15) = 0.013363
Add: 0.148368+0.013363 = 0.161731
(you will need a calculator or binomial probability table)
2)
E(x) = np
= 15(0.75) = 11.25
3)
n=12
x=2
p=0.1
P(x=2) = 12C2 (0.1)^2 (0.9)^10 = 0.230128
(you will need a calculator or binomial probability table)