Activity 3. Do It Yourself Solve the following problems: 1. The average rating of a public senior high school students in a certain division of region X is 85% with a standard deviation of 3. a. If a sudent is selected, what is the probability that his average ratir is greater than 80 %? Step 1. Identify the given information Step 2. Identify what is ask Step 3. Identify the formula to be used. Formula to be used to standardize 80 would be Step 4. Solve the problem Solution: Illustration: Step 5. State the final answer. a. If a random sample of 20 senior high school students is selected, what is the probability that the average rating is less than 80 %? Step 1. Identify the given information Step 2. Identify what is ask Step 3. Identify the formula to be used. When dealing with an individual data obtained from the population, the formula to be used to standardize 80 would be Step 4. Solve the problem Solution: Illustration:

2. Mary measures the weights of five newly hatched pythons in grams. Here are her results: 29 30 32 34 35 Calculate the mean and standard deviation of python weights using the formula for each. Show your work!

9. Write the appropriate notation symbol that corresponds to the given parameter or statistic. a. Population Mean: tof births d. Population Standard Deviation: variable? Triplets b. Sample Mean: e. Sample Variance: c. Population Variance: f. Sample Standard Deviation: sihle for the standard deviation of a list of numbers to equal zero?

Consider the data from the Anthropology 105 class.  The mean for women is 64.33 in and the standard deviation is 2.64 in. The average height of men in the US is approximately 5ft 10in. What proportion of women represented here are shorter than the average man?