Answer:
Step-by-step explanation:
Given that a math exam has 44 multiple choice questions, each with choices a to d.
A student answers just by guessing. So no of questions he answers X is binomial with constant probability 1/4 = 0.25
We can find probabibility using binomial as
P(X=12) =
If approximated to normal we have
mean = np = 11
Std dev =
With continuity correction we get
P(X<12)
=P(X<11.5)
=0.5691
Answer:
$18.05
Step-by-step explanation:
I think you do 550 x .16(16%)=88 and each CD sells for 44 so 88/44
Answer= He needs to sell 2 CD's
Use the slope formula
Plug in the appropriate cords into the formula.
The slope of the line is -9/14.
Answer:
a) P(x=3)=0.089
b) P(x≥3)=0.938
c) 1.5 arrivals
Step-by-step explanation:
Let t be the time (in hours), then random variable X is the number of people arriving for treatment at an emergency room.
The variable X is modeled by a Poisson process with a rate parameter of λ=6.
The probability of exactly k arrivals in a particular hour can be written as:
a) The probability that exactly 3 arrivals occur during a particular hour is:
b) The probability that <em>at least</em> 3 people arrive during a particular hour is:
c) In this case, t=0.25, so we recalculate the parameter as:
The expected value for a Poisson distribution is equal to its parameter λ, so in this case we expect 1.5 arrivals in a period of 15 minutes.