Answer:
e). the sample size is n = 1000 and 50 percent of all students use the vending machines.
Step-by-step explanation:
The efficiency of the test would be highest when the sample size includes a minimum of 1000 samples and at least half of the students must use them. Conducting the test under such conditions would make it impactful and show if the idea would be successful and beneficial or not. <u>If a lesser percentage of students use it, its investment might be difficult to recover or if the test is conducted with a smaller population, the results or outcomes might not be reliable or trustworthy for representing the entire population</u>. Thus, <u>option e</u> shows the correct situations.
The answer is 9. idk why you deleted my answer
Multiply is product. Divide is quotient
Answer:
19/72
Step-by-step explanation:
To calculate the probability that a randomly-chosen child from this group likes either Chess or Swimming but not Football?
We already know the number that liked chess only which is 10, we have to solve for those that liked swimming only which is
8+7+16+x = 40
x which represent swimming only is
40-31 = 9
Thus probability = 10/72 + 9/72 = 19/72