zay179
26.01.2021 •
Mathematics
A normal distribution has a mean of 25 and a standard deviation of 5. Match the
probabilities that a randomly selected x-value from the distribution is in the given
interval.
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Ответ:
a+b = 25, or
b = 25 -a …(1)
ab = 150, or
b = 150/a … (2_
Equate (1) and (2)
25-a = 150/a, or
-a^2+25a-150 = 0
a^2-25a+150 = 0
(a-10)(a-15) = 0
The numbers are 10 and 15.
10 = 2x5
15 = 3x5
HCF = 5. Answer.
Hope this helps!