The mean is 250.875.
Using this information, I can put the following into a calculator:
√(((250.875-195)²+(250.875-358)²+(250.875-201)²+(250.875-276)²+
(250.875-161)²+(250.875-301)²+(250.875-387)²+(250.875-128)²)÷8)
Which equals:
87.9878
This is the standard deviation of the MP3 players.
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The answer is 240.
25% = 
Instead of multiplying the % with the number, we will be dividing.
Multiply the reciprocal of the % with 60 and that would be your answer.


The answer is equation 2. The reasoning is because a linear function is y=mx+b
therefore, y=8x+1 seems to be very close.
Answer:
4
Step-by-step explanation:
54 x 40 = 2160 L
2160 ÷ 600 = 3.6 = 4