It is A because if you subtract 9 and 6 you get 3 and then you add the 4 and get 7
Answer:
The first one
Step-by-step explanation:
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Answer:
95% confidence interval for the proportion of students supporting the fee increase is [0.767, 0.815]. Option C
Step-by-step explanation:
The confidence interval for a proportion is given as [p +/- margin of error (E)]
p is sample proportion = 870/1,100 = 0.791
n is sample size = 1,100
confidence level (C) = 95% = 0.95
significance level = 1 - C = 1 - 0.95 = 0.05 = 5%
critical value (z) at 5% significance level is 1.96.
E = z × sqrt[p(1-p) ÷ n] = 1.96 × sqrt[0.791(1-0.791) ÷ 1,100] = 1.96 × 0.0123 = 0.024
Lower limit of proportion = p - E = 0.791 - 0.024 = 0.767
Upper limit of proportion = p + E = 0.791 + 0.024 = 0.815
95% confidence interval for the proportion of students supporting the fee increase is between a lower limit of 0.767 and an upper limit of 0.815.
2 trips. The volume of the truck bed is 3.75 cubic meters, and they need 7 cubic meters. 3.75 times 2 is 7.5 cubic meters. It cannot have less than a full trip, and it cannot transport the whole load in one trip, so in order for the whole load to be delivered, it is necessary for the truck to make 2 trips.
