IQ scores are approximately N(100, 15).
Approximately what percent of scores lie between 70 and 130?
- Acheck_circle
95%
- B
50%
- C
99.7%
- D
68%
Explanation
70 = μ − 2σ and 130 = μ + 2σ. About 95% of values lie within 2 SD of the mean.
The Normal Distribution
AP Statistics· difficulty 3/5
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