The Answer is B. I hope this helped.
D.4 he should apply 4 treatments to each of the groups
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
My best Guess is
1.282 for upper . , -1.282 for lower.
Hope this Helps
-Dante
