sonyfan
01.02.2020 •
Mathematics
25 ! algebra 2 statistics
a researcher determined that the heights of male students in a particular town are normally distributed with a mean of 65 inches and a standard deviation of 1.7. use the graph above to answer the following questions:
a. what percentage of these students is taller than 66.7 inches?
b. if the data are based on 300 students, how many students are between 61.6 and 68.4 inches tall? explain.
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Ответ:
a. 65 + 1 SD = 65 + 1.7 = 66.7 in
It means that there are : 100% - ( 50% + 34% ) = 100% - 84% = 16% students taller than 66.7 inches.
b. Heights between 61.6 in and 68.7 in are within 2 standard deviations:
13.5% + 34% + 13.5% + 34% = 95%
0.95 * 300 = 285
There are 285 students between 61.6 in and 68.7 in tall.
Ответ:
Step-by-step explanation:
eliminăm parantezele:
a²+16a+64-(12b+60)
calculăm:
a²+16a+64-12b-60
Rezultatul:
a²+16a+4-12b