Standard normal distribution
If the random variable z is the standard normal score and a > 0, is it true that P(z > -a) = P(z < a)? Why or why not? & Find the (two) z-scores that bound the middle 40% of the standard normal distribution.
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A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 2.70 to 4.60 rev/s while rotating through one half of a revolution. How much time does this maneuver take?
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A 0.30 kg toy is attached to the end of a horizontal string and rotated in a circle of radius 1.6 m on a frictionless horizontal surface. If the string will break when the tension in it exceeds 56 N, what is the maximum speed the toy can have?
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From a well shuffled pack of cards, four cards were drawn( one card at a time) with replacment technique. What is the probability all cards are black.
What is the probability of selecting a sample of 50 one-bedroom apartment and finding the mean which is at least $6000.
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