usic school has budgeted to purchase 3 musical instruments. They plan to purchase a piano costing $3,000, a guitar costing $650, and a drum set costing $750. The mean cost for a piano is $4,000 with a standard deviation of $2,000. The mean cost for a guitar is $550 with a standard deviation of $250. The mean cost for drums is $1050 with a standard deviation of $100. (Enter your answers to two decimal places.) How many standard deviations above or below the average piano cost is the piano?
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.
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