1.4×5=7
0.8×10=8
1.4×10=14
1×15=15
15+14+8+7=44
44÷4=11
LQ of 44=11
LQ=10 minutes
11×3=33
UQ= 29 minutes
The Range is 19 minutes
Step-by-step explanation:
Start with the separate boxes. So to work out the real number of students in each bracket, we do Frequency density × The difference in the bracket. (so if its 5-15 then the difference is 10)
This leads us to have the amounts of students in each bracket.
Then work out the LQ of 44 and its 11.
Then find where the 11th student's result is and in this case its in the 5-15. There is 7 already passed and 8 in 5-15. This means that the 11th is in the middle of 5-15 as 7+4=11. The middle of 5-15 is 10.
Repeat this for the UQ.
The range is UQ-LQ so 29-10=19 minutes.
Hope this helps, i'm not fully sure whether this makes sense and i've no clue what the things ive called brackets are actually called.
Answer:
19 mins
Step-by-step explanation:
1.4 × 5 = 7
0.8 × 10 = 8
1.4 × 10 = 14
1 × 15 = 15
15 + 14 + 8 + 7 = 44
44 / 4 = 11
Lower Quartile of 44 = 11
Lower Quartile = 10 minutes
11 × 3 = 33
Upper Quartile = 29 minutes
The Range is 19 minutes
