1. in conducting a statistical study about the number of hours full-time students work at Grossmont College, Leanne separated all students into 8 different classes based on age.She then selected 10% of the students in each group to conduct her study.What sampling technique was used?

2.The scores on a certain test are normally distributed with a mean score of 75 and a sample standard deviation of 8.What is the probability that a randomly selected students will have a mean score greater than 83?Express as a percent rounded to 2 decimals places.

3.You want to estimate the mean number of sentences in a magazine advertisement.How many magazine advertisements must be included in the sample if you want to be 95% confident that the sample mean is within an error of 2 sentences of the population?You know the population standard deviation to be?=5.85

4.At a large school of 2000 students the median math score for fifty students who took the assessment test was 58.0.In statistical terms, what do we call the 58.0 figure?

5,The age of adults attending the opening of a new restaurant is displayed in the histogram below.Use the histogram to answer the following questions.

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