Expand Your Knowledge: Estimating the Standard DeviationConsumer Reports gave information about the ages at which various household products are replaced. For example, color TVs are replaced at an average age of
(a) The
ESTIMATING THE STANDARD DEVIATION
For a symmetric, bell-shaped distribution,
where it is estimated that about 95% of the commonly occurring data values fall into this range.
Use this “rule of thumb" to approximate the standard deviation of x values, where x is the age (in years) at which a color TV is replaced.
(b) What is the probability that someone will keep a color TV more than 5 years before replacement?
(c) What is the probability that someone will keep a color TV fewer than 10 years before replacement?
(d)Inverse
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Chapter 7 Solutions
UNDERSTANDING BASIC STAT LL BUND >A< F
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill