(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.
Answer:
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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