Answer:
The answer is 0.9599.
Explanation:
mu (sample) = mu = 8.4
s.d. (sample) = 1.8/ sq. rt. 40
P( greater than 8.1) = (8.9-8.4)/(1.8/ sq. rt. 40)
Let x be the mean time for the 40 mechanics
Standardize the mechanics: (8.9-8.4)/(1.8/ sq. rt. 40) = 1.75 = Z
P( x > 8.9) = P(Z > 1.75), this means the area to the right of Z = 1.75.
Then you need to look in the table of the Normal distribution, Z(1.75) =0.9599
Outlier is a value which looks isolated from other values, and it can be either upper or lower end.
A good stem and leaf plot
* shows the first digits of the number (thousands, hundreds or tens) as the stem and shows the last digit (ones) as the leaf.
* usually uses whole numbers. Anything that has a decimal point is rounded to the nearest whole number. For example, test results, speeds, heights, weights, etc.
* looks like a bar graph when it is turned on its side.
* shows how the data are spread—that is, highest number, lowest number, most common number and outliers (a number that lies outside the main group of numbers).
Answer:
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