Find the weighted mean
A student gets quiz grades of 55,70,82, and 94. He gets a score of 85 on his final exam. Find the weighted mean if the quizzes each count 15% and the final exam counts for 40% of the final grade.
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Give a 95% confidence interval for the mean blood phosphorus level for 5.4 5.2 2.5 4.9 5.7 and 6.3 mg/dL. Also, what sample size would be needed for a margin of error of 0.25 mg/dL for 95% confidence?
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A burst of mesons travel down an evacuated beam tube at Fermilab at beta =.92 with respect to the laboratory. a) compute y for this group of pions. b) The proper mean lifetime of pions is 2.6*10^-8 sec. What mean lifetime is measured in the lab?
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