For a field trip, the school bought 47 sandwiches for $4.60 each and 39 bags of chips for $1.25 each. How much did the school sp
2 answers:
Answer:
Step-by-step explanation:
You know that 1 sandwich costs $4.60 and the school bought 47 sandwiches.
Therefore, in order to calculate the total cost of 47 sandwiches, you need to multiply this number of sandwiches bought by the schoole, by the cost of 1 sandwich. Then:
You know that 1 bag of chip costs $1.25 and the school bought 39 bags of chips.
So, in order to calculate the total cost of 39 bags of chips, you must multiply the total number of them bought by the school, by the cost of 1 bag of chips.
Then:
Therefore, the total amount school spent was:
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Answer:
The equation is set up wrong
Step-by-step explanation:
Answer:
The 95% confidence interval for the mean life expectancy of non-hispanic white males is (73.3 years, 79.3 years).
Step-by-step explanation:
This is the 95% confidence interval for the mean life expectancy of non-hispanic white males.
Our sample size is 100
The first step to solve this problem is finding our degrees of freedom, that is, the sample size subtracted by 1. So
Then, we need to subtract one by the confidence level and divide by 2. So:
Now, we need our answers from both steps above to find a value T in the t-distribution table. So, with 99 and 0.025 in the two-sided t-distribution table, we have
Now, we find the standard deviation of the sample. This is the division of the standard deviation by the square root of the sample size. So
Now, we multiply T and s
Then
The lower end of the confidence interval is the mean subtracted by M. So:
The upper end of the confidence interval is the mean added to M. So:
The 95% confidence interval for the mean life expectancy of non-hispanic white males is (73.3 years, 79.3 years).