Answer:
b. Invalid, because the sample may not be representative of the population.
Step-by-step explanation:
A sample of around 10% of the population is needed to be representative.
In this question:
We have a population of 500,000, and a sample of 10,000.
10,000/500,000 = 1/50 = 0.02 = 2% of the population, so not representative, and option b is correct.
Answer:
80
Step-by-step explanation:
We have, 75% × x = 60
or,
75/ 100 × x = 60
Multiplying both sides by 100 and dividing both sides by 75,
we have x = 60 × 100/75
x = 80
Answer:
x
=
3
,
−
8
Step-by-step explanation:
Answer:
D
Step-by-step explanation:
-3/8 ÷ (-1/3)
-3/8 × (-3/1)
9/8
1 1/8
Answer:
4 times
Step-by-step explanation:
How many times does 8 go into 33?
Divide
33/8
4.125
Ignore the decimal because it is not a whole number
4
4 times
Hope this helps :)
