What percent of IQ scores are less than 122? B. What is the probability that a randomly selected adult in this age group has an IQ score higher than 147? Is this a significant/unusual event? Explain. C. What percent of adults in this age group have  IQs between 85 and 100? Is this significant/unusual event? Explain.

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A: The total probability is equal to 1.

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A:

Q: The probability distribution of a discrete random variable x is shown in the following table: x 1 2…

A: E(X)=∑Xi P(X)E(X)=1×0.22+2×0.22+3×0.37+4×0.05+5×0.14E(X)=0.22+0.44+1.11+0.2+0.7E(X)=2.67

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Q: 2.2% 2.2% 34.1% 34.1% 0.1% 0.1% 13.6% 13.6% μ-3σ μ-2σ μ-Ισ µ+lo ut20 µ+3o Frequency

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.