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?
The z-score for a particular number (x) is -1.25, where the values have a mean of 175.0 and a standard deviation of 12.0. Find the particular number (x)
At the instant she contacts the water she is traveling in the same direction as her body is pointed. Determine her initial speed as she leaves the board.
If the power plant has an overall thermal efficiency of 32%, determine (a) the amount of coal consumed during one day in kg and (b) the mass flow rate of air through the furnace in kg/s.
List the measures of center from the least affected by outliers to the most affected by outliers.
What is the electric force on the electron when it is at a distance of 3.0x10^-15m from the center of the nucleus? The nucleus of lead is a uniformly charged ball of radius 7.1x10^-15m with a total charge of 82e.
A investor offers to purchase the lease for a single payment of $174,642 payable 10 years from the present. Find the IRR on this investment.
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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