Mathematics test in a high school
On a mathematics test in a high school, scores are normally distributed with a mean of 77 and a standard deviation of 16.8. A student is randomly selected.
Find the probability that his/her test score is smaller than 80.
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What is the frequency in Hz of the photon released when a hydrogen atom undergoes a transition from the excited state where n = 6 to the state where n = 3?
A current of 15 A flows through an electric heater operating on 120 V. What is the heater's resistance? Compute the power consumption of the electric heater in kW? How much energy does it use in 600 min (=10 hours)? (Express the answers in both un
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A contractor wishes to set up a special fund by making uniform semiannual end-of-period deposits for 20 years. The fund is to provide $10,000 at the end of each of the last 5 years of the 20-year period. If interest is 8%, compounded semiannually,
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Determine (a) the normall stresses in aluminum pipe (1) and steel pipe (2); (b) the displacement of flange B . The pic isn't loading but the force is at 160" from the left (at the flange) with 2x 45 kips to the right.
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