Which has the larger standard deviation? O Figure (a) Figure (b) What is the mean of the curve in Figure (a)? What is the mean of the curve in Figure (b)? 15 N C

lecture(12.10d): Fill in blanks. When we are comparing our sample data to population data we used------------------------------when the standard deviation is known.or the------------------------------when the standard deviation is unknown.

f Suppose that you take an exam with 391 possible points and are told that that mean score is 270 and that the standard deviation is 22. You are also told that you got 346. Did you do well on the exam? Explain your answer. Determine the z-score and interpret this score. A score of 346 has a z-score of. This is standard deviations the mean for this exam. The this score is the mean, this is a score. (Round to two decimal places as needed.) standard deviations states that approximately 99.7% of the observations lie within standard deviations of the mean. Sine

Question 4 In an international school, each staff has to take place in at least 3 community services in a year. The following table represents the probability distribution function of the number of community services (X) a staff has been taken in a year. 3 4 5 6. 7 P(X=x) 0.2k k 0.35 0.2 0.03 (a) What is the value of k? (b) Find E(X) and o (X). (c) Suppose the number of community services have been taken by staffs are independent. In a department with 11 staffs, what is the probability that exactly 7 staffs have taken place in at least 5 services? Elementary Statistics

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4 In an Algebra class, the scores on a test are normally distributed. The middle 68% of the scores fall between 80 and 90. What are the mean and standard deviation for this data?Standard Normal Curve                      Mean: Standard Deviation:

Details The scores on a standardized test are normally distributed with a mean of 90 and standard deviation of 8. What test score is 4 standard deviations below the mean?

What is the mean?What is the standard deviation?What percentage of values should fall between 37 and 41?Which value has a z-score of -2?

Interpret the Z score for a student who scored an 91 on an exam that had a mean of 86 and a standard deviation of 5. One mean above the standard deviation One standard deviation above the mean One standard deviation below the mean One mean below the standard deviation