Probability of a sample mean in a specific interval

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pipe0076

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Jul 8, 2012
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2
μ=48
σ=15

What is the probability that a sample size of 50 would yield a sample mean within the interval μ±2σ/sqrtofn

I am unsure of how to use the graphs symmetry to solve this.
 
Since you did not share the graph, one can only guess. Try adding up the four middle sections.
 
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