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Mrrafil [7]
3 years ago
7

For his long distance phone service, Milan pays a$ 5 monthly fee plus 9 cents per minute. Last month, Milan's long distance bill

was $ 18.59. For how many minutes was Milan billed?
Mathematics
1 answer:
Stels [109]3 years ago
5 0
18.59- the $5 service fee is 13.59

13.59/.09 is 151 minuets
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A ribbon is 12 3/8.Into how many 3/4 peices can it be cut?
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let's firstly convert the mixed fraction to improper fraction, and then divide.


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The sum of 3 times a number and 1 is 17 decreased by the number. What expression will be translated on the left side of the equa
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xP(x)00.2510.0520.1530.55Find the standard deviation of this probability distribution. Give your answer to at least 2 decimal pl
Nookie1986 [14]

The Solution:

Given:

Required:

Find the standard deviation of the probability distribution.

Step 1:

Find the expected value of the probability distribution.

E(x)=\mu=\sum_{i\mathop{=}0}^3x_iP_(x_i)\begin{gathered} \mu=(0\times0.25)+(1\times0.05)+(2\times0.15)+(3\times0.55) \\  \\ \mu=0+0.05+0.30+1.65=2.0 \end{gathered}

Step 2:

Find the standard deviation.

Standard\text{ Deviation}=\sqrt{\sum_{i\mathop{=}0}^3(x_i-\mu)^2P_(x_i)}=(0-2)^2(0.25)+(1-2)^2(0.05)+(2-2)^2(0.15)+(3-2)^2(0.55)=4(0.25)+1(0.05)+0(0.15)+1(0.55)=1+0.05+0+0.55=1.60

Thus, the standard deviation is 1.60

Answer:

1.60

8 0
1 year ago
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