DURPA batteries have an average lifetime of 3years and a variance of 0.25 years2. If we assume that the lifetime of these batteries obeys a normal distribution, find theprobability that a battery lasts less than 2.3 years.
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A: Soln : 1
DURPA batteries have an average lifetime of 3
years and a variance of 0.25 years2
. If we assume that the lifetime of these batteries obeys a
probability that a battery lasts less than 2.3 years.
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- Given that age of ECU students is normally distributed. A random sample of 16 students had an average age of 25 years and a variance of 4 square years. The 98% CI for the true average age of all ECU students is?The mean age of 31 slot mechanic player is 51.3 years, and the standard deviation is 6.8 years.the mean age of a different sample of 35 roulette player is 54.8 year and standard deviation is 3.2 years. Can it be concluded at alpha = 0.01 that the mean age of slot machine players is less than those players roulette? Assume the variance are equal Step 1= Step 2= Step 3= Step 4=IF THE VARIANCE OF A POPULATION IS 0.75, THE STANDARD DEVIATION MUST BE?
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