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(1 point) Consider a normal distribution curve where 90-th percentile is at 11 and the 25-th...

(1 point) Consider a normal distribution curve where 90-th percentile is at 11 and the 25-th percentile is at 9. Use this information to find the mean,  ?μ , and the standard deviation, ?σ , of the distribution.

a) ?=μ=  

b) ?=σ=  

(1 point) Length of skateboards in a skateshop are normally distributed with a mean of 31.3 in and a standard deviation of 0.5 in. The figure below shows the distribution of the length of skateboards in a skateshop. Calculate the shaded area under the curve.  Express your answer in decimal form with at least two decimal place accuracy.
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Math   Statistics-And-Probability   
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Answer #1

for 2nd question i need the graph to provide you with the answer of shaded area!!!

please rate my answer and comment for doubts.

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