Normal distribution
The lifetime of acertain type of calculator battery are normally distributed the mean life is 400hours and standard deviation is 50 hours for a group of 500 batteries ,how many are expected to last between 350 hours and 450 hours and again more than 300 hours and less than 300 hours
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27. On a standardized test with a normal distribution, the mean was 64.3 and the standard...
27. On a standardized test with a normal distribution, the mean was 64.3 and the standard deviation was 5.4. What is the best approximation of the percent of scores that fell between 61.6 and 75.1? 28. The mean of a normally distributed set of data is 52 and the standard deviation is 4. Approximately 95% of all the cases will lie between which measures? 29. Battery lifetime is normally distributed for large samples. The mean lifetime is 500 days and...
The lifetime of a certain type of battery is normally distributed with mean value 10 hours...
The lifetime of a certain type of battery is normally distributed with mean value 10 hours (a) If a pack of 4 batteries is purchased, what is the probability that the average lifetime of the (b) How many batteries must be purchased such that the probability that their average lifetime is at and standard deviation 1 hour batteries in the package is at least 9 hours? least 9.5 hours is .99?
NeverReady batteries has engineered a newer, longer-lasting AAA battery. This battery has an average life span...
NeverReady batteries has engineered a newer, longer-lasting AAA battery. This battery has an average life span of 17 hours with a standard deviation of 0.8 hours. Assume that the lifetime is distributed approximately normally. What is the probability of getting a battery with lifetime16 hours or less? (Round to 3 decimal places) NeverReady batteries has engineered a newer, longer-lasting AAA battery. This battery has an average life span of 17 hours with a standard deviation of 0.8 hours. Assume that...
A Texas Instrument calculator operating life is normally distributed with a mean of 3,850 hours, and...
A Texas Instrument calculator operating life is normally distributed with a mean of 3,850 hours, and a standard deviation of 350 hours. What is the probability that the batteries will last between 3900 and 4200 hours?
. The lifetimes of bateries sold by company x are normaly distributed, with mean 150 hours...
. The lifetimes of bateries sold by company x are normaly distributed, with mean 150 hours and standard deviation 25 hours. A box contains 12 batteries from company X (a) Find the expected number of these batteries that have a lifetime of more than 160 hours. The lifetimes of batteries sold by company Y are normally distributed, with mean 160 hours and 80% of these batteries have a lifetime of less than 180 hours. (b) Find the standard deviation of...
Ex. 52 The lifetime of a certain type of battery is normally distributed with mean value 10 hours and standard deviation 1 hour. There are four batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package excee
Ex. 52The lifetime of a certain type of battery is normally distributed with mean value 10 hours and standard deviation 1 hour. There are four batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages?
The lifetime of a certain type of battery is normally distributed with mean value 14 hours...
The lifetime of a certain type of battery is normally distributed with mean value 14 hours and standard deviation 1 hour. There are nine batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages? (Round your answer to two decimal places.) hours
U/8 Points DETAILS PREVIOUS ANSWERS DEVURESTA19 5...052.NVA The lifetime of a certain type of battery is...
U/8 Points DETAILS PREVIOUS ANSWERS DEVURESTA19 5...052.NVA The lifetime of a certain type of battery is normally distributed with mean value 13 hours and standard deviation 1 hour. There are nine batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages? (Round your answer to two decimal places.) 14.65 hours Sud Work Romeo Last Response
The lifetime of a certain type of battery is normally distributed with mean value 13 hours...
The lifetime of a certain type of battery is normally distributed with mean value 13 hours and standard deviation 1 hour. There are nine batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages? (Round your answer to two decimal places.) X hours
The lifetime of a certain type of battery is normally distributed with mean value 12 hours...
The lifetime of a certain type of battery is normally distributed with mean value 12 hours and standard deviation 1 hour. There are nine batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages? (Round your answer to two decimal places.)
27. On a standardized test with a normal distribution, the mean was 64.3 and the standard deviation was 5.4. What is the best approximation of the percent of scores that fell between 61.6 and 75.1? 28. The mean of a normally distributed set of data is 52 and the standard deviation is 4. Approximately 95% of all the cases will lie between which measures? 29. Battery lifetime is normally distributed for large samples. The mean lifetime is 500 days and...
The lifetime of a certain type of battery is normally distributed with mean value 10 hours (a) If a pack of 4 batteries is purchased, what is the probability that the average lifetime of the (b) How many batteries must be purchased such that the probability that their average lifetime is at and standard deviation 1 hour batteries in the package is at least 9 hours? least 9.5 hours is .99?
. The lifetimes of bateries sold by company x are normaly distributed, with mean 150 hours and standard deviation 25 hours. A box contains 12 batteries from company X (a) Find the expected number of these batteries that have a lifetime of more than 160 hours. The lifetimes of batteries sold by company Y are normally distributed, with mean 160 hours and 80% of these batteries have a lifetime of less than 180 hours. (b) Find the standard deviation of...
The lifetime of a certain type of battery is normally distributed with mean value 14 hours and standard deviation 1 hour. There are nine batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages? (Round your answer to two decimal places.) hours
U/8 Points DETAILS PREVIOUS ANSWERS DEVURESTA19 5...052.NVA The lifetime of a certain type of battery is normally distributed with mean value 13 hours and standard deviation 1 hour. There are nine batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages? (Round your answer to two decimal places.) 14.65 hours Sud Work Romeo Last Response
The lifetime of a certain type of battery is normally distributed with mean value 13 hours and standard deviation 1 hour. There are nine batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages? (Round your answer to two decimal places.) X hours
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