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?IF THE VARIANCE OF A POPULATION IS 0.75, THE STANDARD DEVIATION MUST BE?Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 4.14.1 parts/million (ppm). A researcher believes that the current ozone level is at an excess level. The mean of 66 samples is 4.34.3 ppm with a variance of 1.001.00. Does the data support the claim at the 0.0250.025 level? Assume the population distribution is approximately normal. Step 1 of 5: State the null and alternative hypotheses.