Bob can type 2 letters in 4 hours while Bill can do it in 6 hours. How many hours would it take them to type six letters togethe
2 answers:
You might be interested in
Let X be the number of boys in n selected births. Let p be the probability of getting baby boy on selected birth.
Here n=10. Also the male and female births are equally likely it means chance of baby boy or girl is 1/2
P(Boy) = P(girl) =0.5
p =0.5
From given information we have n =10 fixed number of trials, p is probability of success which is constant for each trial . And each trial is independent of each other.
So X follows Binomial distribution with n=10 and p=0.5
The probability function of Binomial distribution for k number of success, x=k is given as
P(X=k) =
We have to find probability of getting 8 boys in n=10 births
P(X=8) =
= 45 * 0.0039 * 0.25
P(X = 8) = 0.0438
The probability of getting exactly 8 boys in selected 10 births is 0.044
We're looking for 
such that
so for some integer
we can write
Apply Euclid's algorithm:
From this we have
which means 307 is the inverse of 43 modulo 660.
so for some integer
Apply Euclid's algorithm:
From this we have
which means 307 is the inverse of 43 modulo 660.