Answer:
2 2/3 cups of sugar
Step-by-step explanation:
If your ratio is 3 flour to 4 sugar, and you use 2 cups of flour, set up your proportion as follows:
Cross multiply to get 3x = 8 and x = 8/3 which is 2 and 2/3 cups of sugar.
Please help me sec theta - cos theta= sin^2 theta/ cos theta
2 answers:
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Answer:
OR
(15.102, 15.498)
Step-by-step explanation:
The formula to find the confidence interval is given by :-
, where n is the sample size
= sample standard deviation.
= Sample mean
= Two tailed z-value for significance level of
.
Given : Confidence level = 95% = 0.95
Significance level =
sample size : n= 250 , which is extremely large ( than n=30) .
So we assume sample standard deviation is the population standard deviation.
thus ,
By standard normal distribution table ,
Two tailed z-value for Significance level of 0.05 :
Then, the 95% confidence interval for the mean credit hours taken by a student each quarter :-
Hence, the mean credit hours taken by a student each quarter using a 95% confidence interval. =(15.102, 15.498)