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The lifetime of a particular type of light bulb are approximately normally distributed with a mean of 1200 hours and a standard deviation of 140 hours.
a) Find the probability that a randomly chosen bulb will burn longer than 1400 hours.
b) Find the probability that a randomly chosen bulb will last between 1000 and 1050 hours
c) Twenty percent of the lightbulbs have a lifetime of less than what value?
d) At what number of hours should the warranty lifetime be set so that only 2% of bulbs must be replaced under warranty?
Find a point estimate for the population mean. Assume the standard deviation was 0.75 nights (s = 0.75).
a distribution with a mean of micro 62 and a standard deviation of s 8 is transformed into a standardized distribution
What are the main advantages of standardizing the normal distribution? Please explain.
through the 2012-2013 season lionel messi has scored 215 goals in 246 games played for barcelona for a lifetime 0.86
A manufacturer of barometers believes that the production process yields 2.2% defectives. In a random sample of 250 barometers, 7 are defective.
Find the midrange for the following group of data items: what is the midrange rounded to the nearest tenth?
In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the variance?
Find the value of the constant such that the SNR at the output of the filter will be maximum.- what sampling time will the SNR at the output of the filter be maximized?
What are Bernoulli trials? - What is the relationship between Bernoulli trials and the binomial random variable?
Mammograms Many women choose to have annual mammograms to screen for breast cancer after age 40. A mammogram isn't foolproof.
Our analysis table gives a p-value of 0.01 for Pressure -- all other effects have large pvalues -- larger than 0.25. What does this all mean?
Ten 1st grade classrooms are randomly selected from across the county. What kind of sampling method is being used?
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