The weight of topsoil sold in a week is normally distributed with a mean of 2000 tons and a standard deviation of 200 tons. (a) What percentage of weeks will sales exceed 2100 tons? (Round your answer to two decimal places.)%(b) What percentage of weeks will sales be less than 1600 tons? (Round your answer to two decimal places.)%(c) What percentage of weeks will sales be between 1800 and 2100 tons? (Round your answer to two decimal places.)%
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
The weight of topsoil sold in a week is
%
(b) What percentage of weeks will sales be less than 1600 tons? (Round your answer to two decimal places.)
%
(c) What percentage of weeks will sales be between 1800 and 2100 tons? (Round your answer to two decimal places.)
%
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