The income per household varies normally in a certain state with mean of $9500 and a...
The income per household varies normally in a certain state with mean of $9500 and a standard deviation of $1750. The middle 68% of incomes are between approximately which two values?
Question 5 options:
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8000 and 10000 |
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4250 and 14750 |
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7750 and 11250 |
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6000 and 1300 |
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The income per household varies normally in a certain state with
mean of $9500 and a...
1) The household income in a certain community is normally distributed with a mean of $42,000...
1) The household income in a certain community is normally distributed with a mean of $42,000 and a standard deviation of $5,000. The proportion of households with incomes of at least $50000 is between: a) 5% and 6% b) 44% and 45% c) 94% and 95% d) none 2) The actual weight of "8 oz. chocolate bar" produced by a certain machine are normally distributed with mean 8.1 oz. and standard deviation of 0.1 oz. only 5% of the bars...
Example 2.9 In a certain large city, household annual incomes are considered approximately normally distributed with...
Example 2.9 In a certain large city, household annual incomes are considered approximately normally distributed with a mean of s40,o00 and a standard deviation of s6,ooo. What proportion of households in the city have an annual income over $30,0oo? . If a random sample of 6o households were selected, how many of these households would we expect to have annual incomes . between $35,000 and $45,000?
The daily sales of a certain variety store are approximately normally distributed with a mean of...
The daily sales of a certain variety store are approximately normally distributed with a mean of $10000 and a standard deviation of $2000. What is the probability that a random sample of 100 days will yield a mean greater than $9800?
Use your calculator to determine the probabilities. State what you put in for the lower limit,...
Use your calculator to determine the probabilities. State what you put in for the lower limit, upper limit, mean and standard deviation. 1. Maple tree diameters in a forest area are normally distributed with mean 10 inches and standard deviation 2.5 inches. Find the percentage of trees having a diameter greater than 11 inches 2.White blood cell (WBC) count per cubic millimeter of whole blood follows approximately a Normal distribution with mean 7500 and standard deviation of 1750. What percentage...
In a certain state, the mean daily amounts spent on lottery tickets is normally distributed with...
In a certain state, the mean daily amounts spent on lottery tickets is normally distributed with a mean of $9.50 and a standard deviation of $2.50. If 144 lottery customers are randomly selected, find the probability that they spend a mean daily amount between $9 and $10.
The carbon monoxide emission level for a certain type of vehicle varies normally with a mean...
The carbon monoxide emission level for a certain type of vehicle varies normally with a mean of 2.9 grams per mile and a standard deviation of 0.4 gram per mile. Calculate the probability that a randomly selected vehicle of this type has an emission level of at least 3.2 grams per mile. For full credit, your answer must have a sketch with labeled parameters, correct boundaries, appropriate shading, and a correct probability. Suppose 12 vehicles of this type are randomly...
In a certain state, the mean daily amounts spent on lottery tickets is normally distributed with...
In a certain state, the mean daily amounts spent on lottery tickets is normally distributed with a mean of $9.50 and a standard deviation of $2.50. If 100 lottery customers are randomly selected, find the probability that they spend a mean daily amount more than $9.05. DON'T JUST WRITE THE FINAL ANSWER - YOU CAN EARN PARTIAL CREDIT IF IT IS INCORRECT IF YOUR RESPONSE IS DETAILED ENOUGH.
0 A personnel director in a particular state claims that the mean annual income is the...
0 A personnel director in a particular state claims that the mean annual income is the same in one of the state's counties (County A) as it is in another county (County B). In County A, a random sample of 17 residents has a mean annual income of $41,200 and a standard deviation of $8400. In County B, a random sample of 14 residents has a mean annual income of $39,000 and a standard deviation of $5900. At a =...
The per capita disposable income for residents of a U.S. city in a recent year is...
The per capita disposable income for residents of a U.S. city in a recent year is normally distributed, with a mean of about $44,000 and a standard deviation of about $2450. Use this information in Exercises 7-10. 7. Find the probability that the disposable income of a resident is more than $45,000. Is this an unusual event? Explain. 8. Out of 800 residents, about how many would you expect to have a disposable income of between $40,000 and $42,000? 9....
Past records suggest that the mean annual income, Hy, of teachers in state of California is...
Past records suggest that the mean annual income, Hy, of teachers in state of California is less than or equal to the mean annual income, Hy, of teachers in Oregon. In a current study, a random sample of 10 teachers from California and an independent random sample of 10 teachers from Oregon have been asked to report their mean annual income. The data obtained are as follows: Annual income in dollars California 43096,44370,53093, 52462, 41185, 49592, 41491, 45798,43632, 48322 Oregon...
Example 2.9 In a certain large city, household annual incomes are considered approximately normally distributed with a mean of s40,o00 and a standard deviation of s6,ooo. What proportion of households in the city have an annual income over $30,0oo? . If a random sample of 6o households were selected, how many of these households would we expect to have annual incomes . between $35,000 and $45,000?
0 A personnel director in a particular state claims that the mean annual income is the same in one of the state's counties (County A) as it is in another county (County B). In County A, a random sample of 17 residents has a mean annual income of $41,200 and a standard deviation of $8400. In County B, a random sample of 14 residents has a mean annual income of $39,000 and a standard deviation of $5900. At a =...
Past records suggest that the mean annual income, Hy, of teachers in state of California is less than or equal to the mean annual income, Hy, of teachers in Oregon. In a current study, a random sample of 10 teachers from California and an independent random sample of 10 teachers from Oregon have been asked to report their mean annual income. The data obtained are as follows: Annual income in dollars California 43096,44370,53093, 52462, 41185, 49592, 41491, 45798,43632, 48322 Oregon...
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