Columbia College ( MATH MISC ) STATS Milestone for A+

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1 The formula for the standard deviation of a sample is: Select the true statement for the following data set that has a mean of 9: 3, 7, 8, 8, 8, 9, 10, 10, 13, 14 Answer choices are rounded to t... he hundredths place.  The variance is 8.50 and the standard deviation is 3.09.  The variance is 9.56 and the standard deviation is 3.09.  The variance is 9.56 and the standard deviation is 8.50.  The variance is 3.09 and the standard deviation is 9.56. RATIONALE We can first calculate the variance of the data, , by using the part of the formula under the square root: Next, we can find the standard deviation, , by simply taking the square root of the variance: We can also use the statistical functions in Excel to quickly find the variance and standard deviation. CONCEPT Standard Deviation 2 Jerry graded seven standardized tests with the following scores: 60, 74, 41, 87, 94, 79, 57 Which standardized test score represents the 50th percentile?  57  74  41  79 RATIONALE The 50th percentile will be the median, or middle number. Make sure to first order the data. The middle number is the 4th value, or 74. CONCEPT Percentiles 3 Mike's electronics store sold the following number of cellphones on each of the seven days of a week. Day Cell Phones Sold Sunday 12 [Show More]

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