gabbys2002
26.10.2019 •
Mathematics
7. as part of a research study you measure participants' heights in inches. the average height of all participants is 70 inches, and the standard deviation is 3 inches. one of your participants, rachel, who is 65 inches tall, wants to know what percentage of the participants are taller than she is. what is the answer to her question?
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Ответ:
95% of the fellow students of this girl are taller than she is
Step-by-step explanation:
First find the z-score for the value 65 when the mean is 70 and the standard deviation is 3:
65 - 70
z = = -5/3, or approximately z = -1.667.
3
Next we determine what fraction of these heights lie above z = -1.667. This can be done on a calculator that has built-in statistical functions, or a table of z-scores. Using the TI-83 Plus: the area above z = -1.667 is 0.95.
In conclusion, 95% of the fellow students of this girl are taller than she is.
Ответ:
c. Large positive number
Step-by-step explanation:
The line is going upward so it is positive and if it is steep then the slope must be large.