Which dog pens will take up the same area?
1 answer:
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Answer:
B) 47.5%
Step-by-step explanation:
Refer to the normal distribution chart attached. If 130 is 2 standard deviations higher than the mean (ignore the numbers beneath the percentages), then by the empirical rule, this means that 34%+13.5%=47.5% of adults are between IQs of 100 and 130. Therefore, option B is correct.
C
the sum to infinity of a geometric series =
where a is the first term and r the common ratio
= = 81 × 3 = 243