Question

use the stem - and - leaf plots to answer the questions. minutes of electronic use per hour
stem leaves
0 2 3 6
1 1 2 4 7
2 0 4 6 8 9
3 0 1 3 5 5

1. students recorded how many minutes per hour they used their devices at home. how many students entered their data on the chart?__ how many students used their device for more than 20 minutes? what is the difference in minutes between the student who used their device the most in one hour and the student who used their device the least in one hour?__

number of fidget spinners seen in one day
stem leaves
0 4 6 8
1 0 4 5 6 7
2 1 3 7 7
3 0 2

1. teachers recorded the number of fidget spinners they saw students using at school in one day. how many teachers saw a fidget spinner?__ two teachers saw the same number of fidget spinners. how many did they see? how many total fidget spinners did the teachers see?__

number of dance tickets sold per day
stem leaves
1 4 6 8
2 0 4 5 6 7
3 1 3 7 7
4 0 2

1. a principal recorded how many dance tickets were sold per day for the end - of - year dance. how many days were tickets sold?__ how many total tickets were sold? how many days were the number of tickets sold greater than 20 but less than 42?__

Explanation:

Step1: Count data - points for electronic - use

Count the number of leaves in the "Minutes of Electronic Use Per Hour" stem - and - leaf plot. There are 3 + 5+5 + 5=18 data - points. So, 18 students entered their data.

Step2: Count students using device > 20 minutes

For students using device more than 20 minutes, count leaves for stems 2 and 3. There are 5 + 5 = 10 students.

Step3: Find max and min for electronic - use

The minimum value is 2 (from stem 0, leaf 2) and the maximum value is 35 (from stem 3, leaf 5). The difference is 35 - 2=33 minutes.

Step4: Count teachers seeing fidget spinners

Count the number of leaves in the "Number of Fidget Spinners Seen in One Day" stem - and - leaf plot. There are 3+5 + 4+2 = 14 teachers.

Step5: Find repeated fidget - spinner count

In the "Number of Fidget Spinners Seen in One Day" plot, the number 27 appears twice. So, the two teachers saw 27 fidget spinners.

Step6: Calculate total fidget spinners

Sum all the values: (04 + 06+08)+(10 + 14+15+16+17)+(21 + 23+27+27)+(30 + 32)=4 + 6+8+10 + 14+15+16+17+21+23+27+27+30+32 = 230 fidget spinners.

Step7: Count days of ticket sales

Count the number of leaves in the "Number of Dance Tickets Sold Per Day" stem - and - leaf plot. There are 3+5 + 4+2 = 14 days.

Step8: Calculate total dance tickets

Sum all the values: (14 + 16+18)+(20 + 24+25+26+27)+(31 + 33+37+37)+(40 + 42)=14+16+18+20+24+25+26+27+31+33+37+37+40+42 = 350 dance tickets.

Step9: Count days with ticket sales between 20 and 42

For stems 2 and 3, there are 5 + 4 = 9 days.

Answer:

1. 18 students; 10 students; 33 minutes
2. 14 teachers; 27 fidget spinners; 230 fidget spinners
3. 14 days; 350 tickets; 9 days