Answer:
It's 0.72
Step-by-step explanation:
It's independent of gender, so we can ignore the boys and girls part.
Adding the columns, 18 pass and 7 failed the last history test.
Adding those two numbers, you get 25.
So, 25 people took the test, and 18 passed.
You can get the probability by dividing 18 by 25.
Dividing that gives us 0.72
I want to believe that it's (0, infinite).
Answer:

Step-by-step explanation:

Apply rule 

Multiply the numbers: 

Answer:
Step-by-step explanation:
Box plot is enclosed.
To find out 5 number summary
3.0, 3.5, 4.5, 5.5, 6.5, 6.5, 7.0, 7.0, 7.0, 7.0, 7.0, 7.5, 8.0, 9.0, 9.0, 9.0, 9.5, 9.5, 9.5, 9.5}
Minimum: 3.0
Quartile Q1: 6.5
Median: 7
Quartile Q3: 9
Maximum: 9.5
Besides we find that
Average (mean): μ=7.25
Absolute deviation: 30.5
Mean deviation: 1.525
Minimum: 3.0
Maximum: 9.5
Variance: 3.7125
Standard deviation σ=1.926
Y = k/x
5 = k/8
k = 5 x 8 = 40
Therefore,
y = 40/14 = 2.86