Answer:
2 hrs
Step-by-step explanation:
Boat moving rate= 11 mph
river's current flow rate= 3 mph
By adding both of them, we get
11 + 3 mph=14 mph
Now,
Time taken= distance travelled/ velocity
= 27/14
= 2 hrs
Answer:
X=9
Step-by-step explanation:
12+15=27
18+x=27
27-18=9
X=9
Answer:
66cm^3
Step-by-step explanation:
V=B×h
V=1/2×4×3×11
V=66
We need to test the hypotheses:
![H_0:p=0.5\\ H_1:p>0.5](https://tex.z-dn.net/?f=%20H_0%3Ap%3D0.5%5C%5C%20H_1%3Ap%3E0.5%20%20)
The
confidence interval for proportion is
.
Here ![p=\frac{670}{1300} =0.5154,n=1300,\alpha =0.05](https://tex.z-dn.net/?f=%20p%3D%5Cfrac%7B670%7D%7B1300%7D%20%3D0.5154%2Cn%3D1300%2C%5Calpha%20%3D0.05%20)
The z value to be used is 1.96.
The 95% CI is
.
Since 0.5 lies in the interval (0.488,0.543), we cannot reject the null hypothesis with 95% confidence.