Mean score of a college entrance test
The mean score of a college entrance test is 500; the standard deviation is 75. The scores are normally distributed. What percent of the students scored below 320?
About 50.82%
About 34.13%
About 7.86%
About 0.82%
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What is the area under the normal curve between z = -1.0 and z = -2.0?
A total of 2.00mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 110g of solution. The reaction caused the temperature of the solution to rise from 21.0 to 24.7 C.
A manufactured battery is defective with the probability of 5%.In a lot of n=200 batteries, approximate the probability that at most 12 car batteries are defective.
Calculate the fuel-air equivalence ratio at which this engine is operating. Is it possible to calculate the fuel's molecular weight with the given information?
Using the CV, compare the variability of the two items. Suggest reasons for any differences
If the propane and air streams enter the chamber at 25.0°C and 1.20 atm (absolute), and the products leave the chamber at 290.0°C and 2.90 atm (absolute), what is the volumetric flow rate of product gas from the chamber?
Work out the overall combustion reaction for stoichiometric combustion of 1 mole of LPG with air, and determine the stoichiometric F/A and A/F ratios.
A simple random sample of 10 software widgets are chosen for installation. If 10% of this type of software widgets have connectivity problems, find the probability of each of the following events.
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