Suppose that the IQ scores of CEIT -03-201P students of a certain school is normally distributed with a mean of 110 and a standard deviation of 16. What the probability that a randomly selected CEIT -03-201P student is between 94 and 150? 34.13% 70.29% 83.51% 73.57%
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- Lifetimes of cell phones have a mean of 24.3 months and a standard deviation of 2.6 months. Find the probability that a randomly chosen sample of 80 cell phones will have a mean lifetime less than 23.5 monthsAssume a standardized IQ test exists that possesses a normal distribution and has a mean score of 100 with a standard deviation of 10 What is the probability of selecting someone from the general population at random who wouldSuppose the age that children learn to walk is normally distributed with a mean 11 months and standard deviation 2.2 month. 35 randomly selected people were asked what age they learned to walk. What is the probability that one randomly selected person learned to walk when the person was between 10.8 and 11.1 months old? For the 35 people find the probability that the average age that they learned to walk is between 10.8 and 11.13 months old? Find the IQR for the average first time walking age for groups of 35 people. For part d, is the assumption that the distribution is normal necessary? Yes or No Q1 = how many months Q3 = how many months IQR = how many months
- A psychologist believes that it will take at least an hour for certain special child to learn a task. A random sample of 30 of these children results in a mean of 50 minutes to learn a task. Should the psychologist modify her belief at 0.01 level if the population standard deviation can be assumed to be 15 minutes?The average score of the students of a certain class in a 100-item quiz is 83 with a standard deviation of 2.5. What is the coefficient of variation?An energy study found that household use of electricity had a mean of 682 and a standard deviation of 551 kilowatt-hours. Suppose the distribution of energy use was normal. Using a table, calculator, or software that can give normal probabilities, find the proportion of households with electricity use greater than 1000 kilowatt-hours.
- 70 million pounds of trout are grown in the U.S. every year. Farm raised trout contain an average of 32 grams of fat per pound, with a standard deviation of 7 grams of fat per pound. A random sample of 38 farm raised trout is selected. The mean fat coherent for the sample is 30.5 grams per pound. Find the probability of observing a sample mean of 30.5 grams of fat per pound or less in a random sample of 38 farm raised trout. Carry intermediate computations to 4 places and your answer to 3Samples are drawn from a population with mean 144 and standard deviation 43. Each sample has 12 randomly and independently chosen elements. Find the mean, uz, of the distribution of sample means.TREKLAIR bulbs have an average lifespan of800 hours with a variance of 1,600 hours2 .This duration oflife has a normal distribution. Find the probability that abulb lasts between 778 and 834 hours.
- Traveling between EDC campus and Gulshan campus of Iqra university via shuttle bus takes, on average, 28 minutes with a standard deviation of 5 minutes. In a given week, a bus transported passengers 40 times. What is the probability that the average transport time was more than 30 minutes? Assume the mean time is measured to the nearest minute.A recent survey reported that 47% of 18- to 29-year-olds in a certain country own tablets. Use binomial distribution. What are the mean and standard deviation of the number of 18 to 29 year old who will own a tablet in a survey of six?Suppose IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability a random sample of 250 people has a mean IQ of more than 102?