21megoplin
08.04.2020 •
Mathematics
In China, 4-year-olds average 3 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.5 hours and the amount of time spent alone is normally distributed. We randomly survey one Chinese 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to two decimal places.A. X ~ N( __ , __ )
B. Find the probability that the child spends less than 2 hours per day unsupervised.
C. What percent of the children spend over 12 hours per day unsupervised?
D. 60 percent of all children spend at least how many hours per day unsupervised?
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Ответ:
The slope of the perpendicular line will be -8/5, or -1.6
Step-by-step explanation:
First we need to rearrange the equation to show the slope, putting in the format y = sx + c:
So the given line has a slope of 5/8.
A line perpendicular to that will have a negative reciprocal of that slope, so it's slope will be -8/5.