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DraeDrae138
01.09.2020 •
Mathematics
11-3x-7-3x=7
x=?
PLEASE HELP I REALLY NEED IT
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Ответ:
x=-1/2
Step-by-step explanation:
-6x+4=7
-6x=7-4
-6x=3
x=3/-6
x=-1/2
Ответ:
According to the Empirical rule, 95 % of all those who took the test should have scores between 70 and 130.
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
68% of the measures are within 1 standard deviation of the mean.
95% of the measures are within 2 standard deviation of the mean.
99.7% of the measures are within 3 standard deviations of the mean.
In this problem, we have that:
Mean = 100
Standard deviation = 15
According to the Empirical rule, 95 % of all those who took the test should have scores
Within 2 standard deviations of the mean
100 - 2*15 = 70
100 + 2*15 = 130
According to the Empirical rule, 95 % of all those who took the test should have scores between 70 and 130.