Question: A random select sample has the following observations: 5, 15, 12, 10 and 8. Calculate: 1. 2. 3. 4. Range: 10 5. Variance: 14.5

A random select sample has the following observations: 5, 15, 12, 10 and 8. Calculate: 1. 2. 3. 4. Range: 10 5. Variance: 14.5 6. 7. Mean: 10 Median: 10 Mode: none Standard deviation: 3.81 Z score Z5 = -1.31 Z8 = -0.52 Z10 = 0 Z12 = 0.52 Z15 = 1.31 8. If the population is normally distributed, (1) find the interval that contains 68.26% of the measurements (2) find the interval that contains 95.44% of the measurements (3) find the interval that contains 99.73% of the measurements 1. [6.19,13.81] 2. [2.38,17.62] 3. [-1.43,21.43]

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