The population mean amount spent per child on back-to-school clothes last fall was $427 with a...
The population mean amount spent per child on back-to-school clothes last fall was $427 with a population standard deviation of $160. Assume amounts spent were normally distributed. What is the probability that the amount spent on a child is between $449.40 and $727.80?
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The population mean amount spent per child on back-to-school
clothes last fall was $427 with a...
1. The average amount parents and children spent per child on back-to-school clothes in Autumn 2010...
1. The average amount parents and children spent per child on back-to-school clothes in Autumn 2010 was $527. Assume the standard deviation is $160 and that the amount spent is normally distributed. What is the probability that the amount spent on a randomly selected child is more than $700? (Round to four decimal places) What is the probability that the amount spent on a randomly selected child is less than $100? (Round to four decimal places) What is the probability...
The mean amount spent by a family of four on food per month is $490 with...
The mean amount spent by a family of four on food per month is $490 with a standard deviation of $78. Assuming that the food costs are normally distributed, what is the probability that a family spends less than $442 per month?
Marketers at PaperClips a regional office supply chain, are researching whether the population mean amount spent...
Marketers at PaperClips a regional office supply chain, are researching whether the population mean amount spent on back to -school shopping for students in grades K-12 has changed from 2016 to 2018, Based on market research the marketers assume that the population standard devation is $101.52 for 2016 and $96.47 for 2018, Households across the region with at least one student in grades K-12 were randomly selected in 2016 and again in 2018. The results are shown in the table...
The mean amount spent by a family of four on food per month is $507 with...
The mean amount spent by a family of four on food per month is $507 with a standard deviation of $73. Assuming that the food costs are normally distributed. a. what is the probability that a family spends less than $406 per month? Give your answer to 4 decimals. b. what is the probability that a family spends at least $711 per month? Give your answer to 4 decimals.
The mean amount spent by a family of four on food is $500 per month with...
The mean amount spent by a family of four on food is $500 per month with a standard deviation of $50. Assuming that food costs are normally distributed. 1. What is the probability that a family spends less than $400 per month ? A. 0.0359. B. 0.9641. C. 0.4641. D. 0.1151 E. 0.0228 2. What is the probability that a family spends between $450 and $600 per month ? A. 0.3413. B. 0.1587. C. 0.4732. D. 0.8185. E. 0.0728 3....
in a recent survey of high school students, it was found that the amount of time...
in a recent survey of high school students, it was found that the amount of time spent on rading books per week, was normally distributed with a mean of 23 minutes. Assume the distribution of weekly reading time follows the normal distribution with a population standart deviation of 2 minutes. Suppose we select a sample of 11 high school students. A- What can we say about the shape of the distributiob of the sample mean time? ….. B- What is...
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.
Please show calculations for this question: The mean amount spent by a family of four on...
Please show calculations for this question: The mean amount spent by a family of four on food per month is $500 with a standard deviation of $75. Assuming that the food costs are normally distributed What is the probability that a family spends less than $410 per month? [z=-1.20; 0.1151] From a sample of 25 families, what is the probability of having a sample mean exceeding $515? [z=1; 0.1587]
In a sample of 13 randomly selected high school seniors, the mean score on a standardized...
In a sample of 13 randomly selected high school seniors, the mean score on a standardized test was 1199 and the standard deviation was 166.0. Further research suggests that the population mean score on this test for high school seniors is 1017. Does the t-value for the original sample fall between -toos and boos? Assume that the population of test scores for high school seniors is normally distributed The t-value oft- fall between -0.99 and long because (Round to two...
Suppose UIL is interested in the amount of money per year that parents pay for private...
Suppose UIL is interested in the amount of money per year that parents pay for private volleyball lessons for their child. High School Sports Illustrated reports that the amount of money per year that parents pay for private volleyball lessons is normally distributed with a mean of $2400 and standard deviation $400. a. What is the probability that a parent payed less than $2,190? b. What is the probability that a parent payed between $2,190 and $2,825? c. Laney was...
Marketers at PaperClips a regional office supply chain, are researching whether the population mean amount spent on back to -school shopping for students in grades K-12 has changed from 2016 to 2018, Based on market research the marketers assume that the population standard devation is $101.52 for 2016 and $96.47 for 2018, Households across the region with at least one student in grades K-12 were randomly selected in 2016 and again in 2018. The results are shown in the table...
In a sample of 13 randomly selected high school seniors, the mean score on a standardized test was 1199 and the standard deviation was 166.0. Further research suggests that the population mean score on this test for high school seniors is 1017. Does the t-value for the original sample fall between -toos and boos? Assume that the population of test scores for high school seniors is normally distributed The t-value oft- fall between -0.99 and long because (Round to two...
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