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.
3 divided by 1/8 = <em>24 and 0/8</em>
Since the cost of the spray paint is approx $1.50,
The range for the cost of the spray paint is'

Therefore, the coach budget should be between,

Hence, the budget of the coach should be between $1.45 and $1.55.
For question 6 the answer is 100 because a quarter of a circle is 90 degrees