Answer:
Step-by-step explanation:
Area of circle:
<em>area = π · r · r</em>
<em>Radius= </em>
= 8
= 200.96 
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Answer:
All three statements are true
Step-by-step explanation:
A shipping fee of 5% is charged online with every item purchased online
First let's just take each option and calculate them based on this, to see if the answers matched
Keith buys a 40 dollar book
40 x 0.05 = 2
Therefore there will be a two dollar fee on Keith's book
40 + 2 =42
The first statement is true
A chair costs $80
80 x 0.05 = 4
80 + 4 = 84
The second statement is true
George buys a 20 dollar calculator
20 x 0.05 = 1
20 + 1 = 21
The third statements are true
All three statements are true
9514 1404 393
Answer:
increase
Step-by-step explanation:
Your cost function appears to be an exponential function of the form ...
c(x) = (initial cost)·(growth factor)^x
When the growth factor (1.03) is greater than 1, it means the exponential function is increasing with x (time).
The cost function increases with time.
Thanks for the supplied normal table; very handy.
We have random variable H with μ=25, σ=6 and we seek P(H < 37).
H=37 corresponds to a z score (number of standard deviations from the mean) of
z = (H - μ)/σ = (37 - 25)/6 = 2
We just found out
P(H < 37) = P(z < 2)
which we can look up. Of course for a nice round z score of 2 we don't really need to look that one up. By the 68-95-99.7 rule, two sigma corresponds to 95%, i.e.
P(-2 < z < 2) = 95%
That means
P(0 < z < 2) = 95/2 = 47.5 %
Of course
P(z < 0) = 50%
so
P(z < 2) = P(z < 0) + P(0 < z < 2) = 50 + 47.5 = 97.5%
Answer: C
For completeness, let's look up z=2 in the table. It doesn't say but this particular table is telling us the answer we want directly.
P(z < 2) = .9772 = 97.72%
which is a bit more accurate than the rule, but in stats that doesn't usually matter much.
