Exam 5: Exploring Data: Distributions

The average length of time, per week, that students at a certain university spend on homework is normally distributed with a mean of 24.3 hours and a standard deviation of 1.4 hours. Jane tells her parents she spends more time studying than 75% of the students on campus. How many hours per week must Jane spend on homework for this to be true?

Refer to this stemplot to answer the following questions: 0 1234 1 03 2 14669 3 4 2789 -What is the range of this data set?

The mean length of time, per week, that students at a certain school spend on their homework is 24.3 hours, with a standard deviation of 1.2 hours. Assuming the distribution of study times is normal, what percent of students spend more than 25.1 hours per week on homework?

Which of the following is true about any normal distribution?

Given the set of data below, find the median. $2,4,4,5,6,9$

Use the following information to answer the Questions: Below is a list of the number of dogs owned by families in a particular neighborhood. 0, 0, 2, 1, 0, 1, 0, 4, 0, 1 -What is the third quartile for these data?

Use the following information to answer the following Questions: Below are the ages of 15 students in a college class. 27, 50, 33, 25, 86, 25, 85, 31, 37, 44, 20, 36, 59, 34, 28 -What is the median age?

Create a set of five positive numbers that have median 8 and mean 6.

Given the set of data below, find the range. $2,4,4,5,6,9$

Use the data set 3, 4, 5, 6, 7. What value could you add to this data set that will cause the median to decrease while the range remains same?

Use the following information to answer the Questions: Below is a list of the number of dogs owned by families in a particular neighborhood. 0, 0, 2, 1, 0, 1, 0, 4, 0, 1 -What is the median number of dogs owned?

If the values in a data set are all multiplied by 3, what happens to the standard deviation?

Use the following information to answer the Questions: Below are the numbers of pages in each of seven chapters of a textbook. 14, 14, 20, 38, 47, 48, 57 -What is the standard deviation?

Use the following information to answer the Questions: Below are the numbers of errors made by a typist on various pages of typing. 14, 6, 12, 19, 2, 35, 5, 4, 3, 7, 5, 8 -Find the mean number of errors.

Below are listed the numbers of children in the classrooms of a small elementary school. Choose the correct stemplot of the data. 12, 14, 20, 21, 21, 25, 27, 30, 30, 30