Suppose the student guesses the answers, we shall consider this a binomial probability problem of success. This implies that getting a question right is p=1/5.
The number of questions is n=20 questions.
The mean of binomial distribution is
mean=n*p= 20*1/5=4
b] The standard deviation of a binomial distribution is given by:
σ=√(n*p*(1-p))
=√(20*0.2*0.8)
=1.79~1.8
Answer:
μ=4 ; σ=1.8
It looks like it might be C
The reason that I said might is because if it is C the second equation should contain -x not x.
Step-by-step explanation:
Total = n, Blue = 1 Red = n-1
(a)The prob. that two bags are blue and red each = prob. of blue and the prob. of red =1/n × n-1/n =n-1/n^2
(b)
Answer:
The answer would be 45
Step-by-step explanation:
120-60=60 which is how much he gets back from selling a bike. divide 2700/60=45 bicycles that have to be sold.
Step-by-step explanation:
- Diagonals are congruent.
- Diagonals bisect angles.
- Diagonals are perpendicular.
- Diagonals bisect each other.