Find the variance and standard for the continuous random variables with density functions 2x for 0 ≤ x ≤ 1 f(x) = 0 otherwise

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Q: Determine the sample size required to estimate the mean score on a standardized test within 2 points…

A: Given,margin of error(E)=2standard deviation(s)=15α=1-0.98=0.02α2=0.01Z0.01=2.33      (from Z-table)

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Q: Class 28-30 31-33 34-36 37-39 40-42 43-45 a. 3 b. 2 C. 1 d. o Frequency 8 8 7 5 1 1 6

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