Unit 5: Surveys, mean, median, mode

What is mean?

The mean of a set of values is the sum of the values divided by the number of values. It is also called the average.

What is median?

The median refers to the midpoint in a series of numbers.

What is mode?

The mode of a set of values is the value that occurs most often. A set of values may have more than one mode or no mode.

What is the Minimum?

15

Chesney found that there were 4 red M&M in her pack on candy. If there is a total of 15 pieces of candy in the pack. How many red M&Ms can Chesney expect to find in a pack of M&Ms that have 100 pieces?

27 red m&m

(use same picture for 15-17 ) What is the median?

35

What is the mean of these five numbers?

75

(18-20)What is the mean of the five numbers?

78

What is the Maximum?

78

What is a bias survey?

A sample drawn in such a way that one or more parts of the population are favored over others.

What is a survey?

A tool used to collect date from a particular group.

(find Mean,Median,Mode)(10-12) 18, 24, 17, 21, 24, 16, 29, 18

Mean=20.9

Who uses surveys?

Schools, businesses, and game shows.

What do they do with the information collected?

They use it to make decisions.

Why do they use surveys?

To find out what people want.

What is an unbias survey?

a sample that is selected so that it is representative of the entire population.

18, 24, 17, 21, 24, 16, 29, 18

median=19.5

18, 24, 17, 21, 24, 16, 29, 18

mode=18,24

What is the mode of these five numbers?

none

Erica wants to know how many books on average are in the school libraries in her county. She randomly calls 50 school libraries in her county and finds out how many books they have. She adds the number of books together and divides by 50. Her consclusion is that there are an average of 18,000 books in the school library. Erica's conclusion is______________.

valid. She used a representative sample