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I'll be honest. *Standard*** deviation** is a more difficult concept than the others we've covered. And unless you are writing for a specialized, professional audience, you'll probably never use the words "

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*Standard*** Deviation**
objective
• Describe

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** Deviation**
Definition:
Behavior commonly seen in children that is the result of some obstacle to normal development such behavior may be commonly understand as negative (a timid child, a destructive child) or positive (a quite child), both positive and negative

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Mean and *Standard*** Deviation**
The mean, indicated by μ (a lower case Greek mu), is the statistician's jargon for the average value of a signal. It is found just as you would expect: add all of the samples together, and divide by N. It looks like this in mathematical form:
In words, sum the values in the signal, xi, by letting the index, i, run from 0 to N-1. Then finish the calculation by dividing the sum by N. This is identical to the equation: μ =(x0 + x1 + x2 + ... + xN-1)/N. If you are not...

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selected.
c) reasonably large due to the “cluster” effect.
d) 100 divided by the size of the population of Laramie.
Costs for ** standard** veterinary services at a local animal hospital follow a Normal distribution with a mean of $80 and a

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milligrams of tar per cigarette and a *standard*** deviation** equal to 1.0 milligram. Suppose a sample of 100 low-tar cigarettes is randomly selected from a day’s production and the tar content is measured in each. Assuming that the tobacco company’s claim is true, what is the probability that the mean tar content of the sample is greater than 4.15 milligrams?
[0.00621]
2. The safety limit of a crane is known to be 32 tons. The mean weight and the

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the mean from part b find the *standard*** deviation** of the probability distribution.
8. A computer password consists of two letters followed by a five-digit number, none of which can be repeated. After 3 tries the computer locks down and notifies security.
a) What is the probability of guessing the correct password on the first try?
b) What it the probability of guessing the correct password within three tries?
9. Find the mean and

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9551/SQRT(300),1) = 0.0783
(c) A circuit contains three resistors wired in series. Each is rated at 6 ohms. Suppose, however, that the true resistance of each one is a normally distributed random variable with a mean of 6 ohms and a *standard*** deviation** of 0.3 ohm. What is the probability that the combined resistance will exceed 19 ohms? How "precise" would the manufacturing process have to be to make the probability less than 0.005 that the combined resistance of the circuit would exceed 19...

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the actuarial field and finds the average salary to be $41,000. The population *standard*** deviation** is $3000. Can her claim be supported at 0.05?
x¯=14.7, μx¯=13.77, ox¯=5.34, n=29, α=.01
3. Monthly Home Rent. The average monthly rent for a one bedroom in San Francisco is $ 1229. A random sample of 15 one bedroom homes about 15 miles outside of San Francisco had a mean rent of $1350. The population

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Sales Price | | Days to Sell | |
| | | | | |
Mean | 474007.5 | Mean | 454222.5 | Mean | 106 |
** Standard** Error | 31194.293 |

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