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- Why is the standard deviation used more frequently than the variance? Choose the correct answer below. A. The standard deviation is easier to compute. B. The standard deviation requires less entries from the data set. OC. The units of variance are squared. Its units are meaningless. осe heights of people in a certain population are normally distributed with a mean of 68 inches and a standard deviation of 3.8 inches. Determine the sampling distribution of the mean for samples of size 43. Exactly normal. Mean = 68 inches. Standard deviation = 0.09 inches. Approximately normal. Mean = 68 inches. Standard deviation = 0.09 inches Exactly normal. Mean = 68 inches. Standard deviation = 0.58 inches. Exactly normal. Mean = 68 inches. Standard deviation = 3.8 inches.In a normal curve, the highest point on the curve occurs at the mean, µ, which is also the: a. Geometric and harmonic mean b. Variance and standard deviation c. Lower and upper quartiles d. Median and mode
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- The number of defects per 1000 machine parts inspected Defects 0 1 2 3 4 5 Probability 0.264 0.299 0.245 0.136 0.036 0.018 Mean Variance Statndard Deviation Interpret the results The mean is ? so the average batch of 1000 machine parts has ? The standard deviation is?so the typical number of defects in a batch of 1000? ▼Use the standand normal distribution table to determine the percent of data between z= -1.91 and z 1.17 The percent of data between z= -1.91 and z = 1.17 is what?uestion 6 For the standard normal distribution, which of the statements below is correct? A. Standard Deviation is 0. B. Variance is 0. C. Mean is 1. D. None of the above. A A B.