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# As a clue to the amount of organic waste in Lake Macatawa ISBN: 9780321923271 41

## Solution for problem 5E Chapter 7.1

Probability and Statistical Inference | 9th Edition

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Problem 5E

PROBLEM 5E

As a clue to the amount of organic waste in Lake Macatawa (see Example 7.1-4), a count was made of the number of bacteria colonies in 100 milliliters of water. The number of colonies, in hundreds, for n = 30 samples of water from the east basin yielded Find an approximate 90% confidence interval for the mean number (say, μE) of colonies in 100 milliliters of water in the east basin.

Reference Example 7.1-4

Let X equal the weight in grams of a “52-gram” snack pack of candies. Assume that the distribution of X is N(μ, 4). A random sample of n = 10 observations of X yielded the following data: (a) Give a point estimate for μ.

(b) Find the endpoints for a 95% confidence interval for μ.

(c) On the basis of these very limited data, what is the probability that an individual snack pack selected at random is filled with less than 52 grams of candy?

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Water --- October 4 Water: Essential to human life The main constituent of body is water  More than 50% of our body is water Extracellular fluid 37% - 17 liters  Blood plasma, lymph, fluid between cells, tears, synovial fluid Intracellular fluid 63% - 25 liters  Blood cells, bone cells, muscle, adipose Total fluid volume is about 40 liters Functions of...

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##### ISBN: 9780321923271

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