he region under the standard normal curve that lies to the left of −1.1 has area 0.135666 Without consulting a table or a calculator giving areas under the standard normal curve, determine the area under the standard normal curve that lies to the right of 1.1. answer: b) Which property of the standard normal curve allowed you to answer part a)? A. The standard normal curve extends indefinitely in both directions B. The standard normal curve is symmetric about 0 C. Almost all the area under the standard normal curve lies between −3 and 3 D. The total area under the curve is 1
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
Fact: the region under the standard normal curve that lies to the left of −1.1 has area 0.135666
Without consulting a table or a calculator giving areas under the standard normal curve, determine the area under the standard normal curve that lies to the right of 1.1.
answer:
b) Which property of the standard normal curve allowed you to answer part a)?
A. The standard normal curve extends indefinitely in both directions
B. The standard normal curve is symmetric about 0
C. Almost all the area under the standard normal curve lies between −3 and 3
D. The total area under the curve is 1
E. None of the above
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