37 students get at most 67 scores.
The numbers 60-67 represent the lower quartile (lowest 25%). 25% of 60 is 15 not 30. Therefore it is incorrect.
Answer:
the lesser number is 13
Step-by-step explanation:
13 + 17 = 30 and they are four apart
Answer:
10.85
Step-by-step explanation:
2x + 1.5x x=3.1
simply plugg in <em>3.1 for X</em>
2 multiplied by 3.1 + 1.5 multiplied by 3.1 and you get
6.2 + 4.65 which = 10.85
The mean of the confidence interval is (0.3775 + 0.6225) / 2 = 0.5. Therefore, the standard deviation of the proportion would have been sqrt[0.5*(1 - 0.5) / n], where n is the sample size. This expression simplifies to sqrt(0.25/n).
A 95% CI has a corresponding z = 1.96, so since the distance from 0.5 to 0.3775 (or 0.6225 to 0.5) is equal to 0.1225. Therefore, if we divide 0.1225 / 1.96 = 0.0625, we get the value of the SD, and this should be equal to sqrt(0.25/n).
0.0625 = sqrt(0.25/n)
n = 64
This means that the proportion was 0.5 and the sample size was 64.
The answer to this question is B
