Weight of food packed in certain containers
The weight of food packed in certain containers is a random variable with a mean of 16 oz. and a standard deviation of .6 oz. If 36 packages are randomly selected, find the probability that the mean will be greater than 16.2 oz.
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You sample 254 students. What is the standard deviation of sampling distribution of their average score?
In the Bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, where the radius of the orbit is approximately 0.542 multiplied by 10-10 m. (The actual value is 0.529 multiplied by 10-10 m.)
The standard deviation of a normal random variable is 20. If a sample of 225 is selected out of a large population, what is the standard error of the mean? Round to 3 decimal places.
A 1 kg block of copper at 350°C is quenched in a 10 kg oil bath initially at ambient temperature of 20°C. Calculate the final uniform temperature (no heat transfer to/from ambient) and the change of availability of the system (copper and o
You are preparing for a 5-day backpacking trip where you plan to use a gasoline cook stove for about 30 min each morning and night. The description of your cook stove brags that the stove can warm 1 L of water to boiling in about 12 min. (a) Estim
The amount of time (in minutes) devuted to commercials on a TV channel during any half-hour program is a random variable whose mean is 6.6 minutes and whose standard deviation is .866 minutes. If 40 half-hour blocks were randomly selected, find th
If the total solidification time of the casting itself is known to be 3.5min. Determine the diamer of the riser so that it will take 25% longer for the riser to solidify.
In 1988 the mean expenses for college were $8000 with a standard deviation of $800. If 40 students were selected at random, what is the probability that the mean expenditure for this sample would be between 6120 and 7800? Round your answer to 4 de
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