Therefore, the 10th percentile of the standard normal distribution is -1.28. If 2000 ticket buyers were in line, how many of them would expect to wait for less than 16 minutes 4. We look to the leftmost of the row and up to the top of the column to find the corresponding z-value. We search the body of the tables and find that the closest value to 0.1000 is 0.1003. So it only depends on whether the Z Score Value is. That is because for a standard normal distribution table, both halfs of the curves on the either side of the mean are identical. In the present study, we have discussed the summary measures to describe the data and methods used to test the normality of the data. Hence we find out that Eric did better than 71.23 of students. The 95 Rule states that approximately 95 of observations fall within two standard. Your textbook uses an abbreviated form of this, known as the 95 Rule, because 95 is the most commonly used interval. The Empirical Rule is a statement about normal distributions. Since the entries in the Standard Normal Cumulative Probability Table represent the probabilities and they are four-decimal-place numbers, we shall write 0.1 as 0.1000 to remind ourselves that it corresponds to the inside entry of the table. To get this as a percentage we multiply that number with 100. A normal distribution is symmetrical and bell-shaped. The question is asking for a value to the left of which has an area of 0.1 under the standard normal curve. To find the probability between these two values, subtract the probability of less than 2 from the probability of less than 3.
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