The lifespan of laptop computers is skewed right with a mean of 5.5 years and a...
Homework Answers
Yes central limit can be applied to any distribution if 'no. of observation (n)>30' irrespective of skewness.
This is because we see that when as the sample size
the
sample becomes normally distributed sample. In general n=30 is
considered large.
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The
lifespan of laptop computers is skewed right with a mean of 5.5
years and a...
1. The mean lifetime of laptop computers produced by one company is 4.6 years with a...
1. The mean lifetime of laptop computers produced by one company is 4.6 years with a standard deviation of 1.1 years. Consider random samples of 55 laptop computers repeatedly taken for 2 weeks. What is the standard deviation of the sampling distribution of the sample means? (If rounding is needed, round to four decimal places). 2 . Suppose that for 18-to-25-year-old men, the mean number of football games watched each football season is 19.0 games with a standard deviation of...
The manager of a computer retails store is concerned that his suppliers have been giving him...
The manager of a computer retails store is concerned that his suppliers have been giving him laptop computers with lower than average quality. His research shows that replacement times for the model laptop of concern are normally distributed with a mean of 3.5 years and a standard deviation of 0.6 years. He then randomly selects records on 29 laptops sold in the past and finds that the mean replacement time is 3.2 years. a. Assuming that the laptop replacement times...
3. The life expectancy of computer terminals is normally distributed with a mean of 5.2 years...
3. The life expectancy of computer terminals is normally distributed with a mean of 5.2 years and a standard deviation of 8 months (2/3 years). Please answer the following questions. (a) What is the probability that a randomly selected terminal will last more than 6 years? (b) What percentage of terminals will last between 3.5 and 5.5 years?
The distribution of weekly salaries at a large company is right-skewed with a mean of $1000...
The distribution of weekly salaries at a large company is right-skewed with a mean of $1000 and a standard deviation of $350. a) Determine the sampling distribution of the mean salary for samples of size 60. b) If a sample of weekly salaries of 60 employees is randomly selected, what is the probability that the sample mean salary will be within $50 of the population mean $1000 (the mean weekly salary for all employees)?
The lifespan of an X-ray tube used as part of an X-ray imaging machine follows a...
The lifespan of an X-ray tube used as part of an X-ray imaging machine follows a normal distribution with a mean of 7 years and a standard deviation of 1.65 years. Standard Normal Distribution Table a. Calculate the probability that a randomly-selected X-ray tube will have a lifespan of: (i) Less than 4 years P(X< 4) = 0 (ii) Greater than 9 years P(X > 9) = 0 (iii) Between 5 and 8 years P(5< X < 8) = 0...
l rt in order for you 2. The lifespan of a new refrigerator is normally distributed...
l rt in order for you 2. The lifespan of a new refrigerator is normally distributed with a mean of 15.2 years standard deviation of 2.1 years. Determine the following and a a) The probability that one randomly selected refrigerator has a lifespan more than 14 years. The probability that one randomly selected refrigerator has a lifespan less than 13 years. b) c) The probability that one randomly selected refrigerator has a lifespan between 12 and 18 years. d) The...
1.) A particular fruit's weights are normally distributed, with a mean of 601 grams and a...
1.) A particular fruit's weights are normally distributed, with a mean of 601 grams and a standard deviation of 34 grams. If you pick 2 fruit at random, what is the probability that their mean weight will be between 599 grams and 668 grams 2.) A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 225.1-cm and a standard deviation of 1.4-cm. For shipment, 15 steel rods are bundled together. Find the...
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.8...
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.8 years, and standard deviation of 2.5 years. If you randomly purchase 15 items, what is the probability that their mean life will be longer than 7 years?
Lifespan: Assume the average life-span of those born in the U.S. is 78.2 years with a...
Lifespan: Assume the average life-span of those born in the U.S. is 78.2 years with a standard deviation of 16 years. The distribution is not normal (it is skewed left). The good people at Live-Longer-USA (fictitious) claim that their regiment of acorns and exercise results in longer life. So far, 40 people on this program have died and the mean age-of-death was 84.7 years. (a) Calculate the probability that a random sample of 40 people from the general population would...
a population is slightly skewed to the right has a mean of 77 and a standard...
a population is slightly skewed to the right has a mean of 77 and a standard deviation of 12. If a random sample of 28 items are selected from this population, then the mean score of these 28 items is from a sampling distribution that jas a mean of...? a population is slightly skewed to the left has a 56 and a standard deviation of 8. If a random sample of 32 items are selected from this population, then the...
The lifespan of an X-ray tube used as part of an X-ray imaging machine follows a normal distribution with a mean of 7 years and a standard deviation of 1.65 years. Standard Normal Distribution Table a. Calculate the probability that a randomly-selected X-ray tube will have a lifespan of: (i) Less than 4 years P(X< 4) = 0 (ii) Greater than 9 years P(X > 9) = 0 (iii) Between 5 and 8 years P(5< X < 8) = 0...
l rt in order for you 2. The lifespan of a new refrigerator is normally distributed with a mean of 15.2 years standard deviation of 2.1 years. Determine the following and a a) The probability that one randomly selected refrigerator has a lifespan more than 14 years. The probability that one randomly selected refrigerator has a lifespan less than 13 years. b) c) The probability that one randomly selected refrigerator has a lifespan between 12 and 18 years. d) The...
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