HOW MANY TRIANGLES ARE THERE?????
2 answers:
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Answer:
Interval within 1 standard deviation: (16.3,19.7)
Interval within 2 standard deviation: (14.6, 21.4)
Interval within 3 standard deviation: (12.9, 23.1)
Step-by-step explanation:
We are given the following in the question:
Population mean, = 18
Standard deviation, = 1.7
We have to find the following intervals:
Interval within 1 standard deviation:
Interval within 2 standard deviation:
Interval within 3 standard deviation:
Let = -9,
= -12 and so on.
-15 = -9 + (-6)
-15 = -9 + 2(-3)
Let -3 be the common difference, or <em>d</em>.
= -9 + n(-3)
= -9 - 3n