Answer:
3
Step-by-step explanation:
2x - 10 = 30
2x = 40
x = 20
Answer:
C : does not have statistical significance
Step-by-step explanation:
Because there is a 15% chance of getting that many girls by chance, the method - does not have statistical significance.
By this method, the percentage of girls =
or 51.15%
This type of method does not have practical significance.
Answer:
81
Step-by-step explanation:
27 total of pupils.
girls 1×27=27
boys 2×27=54
total 54+27=81
Answer:
the answer is D.
Step-by-step explanation: