The amount that two groups of students spent on snacks in one day is shown in the dot plots below.

group a
•
• •
• •
• •
• • •
< >
0. 1. 2. 3. 4. 5

group b

•
• •
• • •
• • • •
< >
0. 1. 2. 3. 4. 5

which statements about the measures of center are true?

select three !

the mean for group a is less than the mean for group b.

the median for group a is less than the median for group b.

the mode for group a is less than the mode for group b.

the median for group a is 2.

the median for group b is 3.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.

An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution