h = prob of hardcover = .25
p = prob of paperback = .75
a.
Prob(2 hardcover of 10) = (10 choose 2) (.25)^2 (.75)^8
= ( 10(9)/2 ) (1/4^10) (1^2 3^8)
= 295245/1048576
≈ 28.15%
b.
I think I just did the binomial distribution. We can approximate it as a normal distribution. The mean and variance in this case are computed thus:
N=10, n=2
μ = Np = 2.5
σ² = Npq = 1.875
σ = 1.3693
P(n) = 1/(σ√2π)e^-(n-μ)/(2σ²)
P(2) = 1/(1.3693√2π)e^-(2 - 2.5)/(2 (1.875))
P(2) = 33.3%
Pretty good, not great.
0.4 is false and 2.5 is true, bigger than 1 means increase.
"help..." said the high schooler.
"No," said Life, "figure it out yourself."
Then the rejected high schooler went to watch YouTube to relieve stress, hour and hours passed by until the high schooler realized he was wasting time.
"Oh no!" He said, "I have wasted time again! How will I ever get pass high school?"
"We will help you," said the flash cards, colored pens, and highlighters "we will be your best friend."
After that day, the high schooler never had an all nighter for the rest of high school. (College is a different story)
Moral of the story: Life and cute cat videos will not help you and your homework. Paying attention in class, making flash cards, making your notes colorful with pens and highlighter are what really helps :)
Oh and asking your teacher for help is great too.
(You forgot to attach a picture to your question)
Answer:
28.137 sq. units.
Step-by-step explanation:
Area of a regular hexagon is
where, a is the side length.
It is given that the side length of the regular hexagon is 
.
Substitute 
in the above formula.
Therefore, the area of regular hexagon is 28.137 sq. units.
