A new pizzeria offers mini-pizzas. Each mini-pizza is topped with 1/4 cup of pizza sauce and 1/3 cup of cheese.

Mathematics

2 answers:

kicyunya [14]2 years ago

8 0

#1 is B and #2 is B!

navik [9.2K]2 years ago

7 0

1) B

2) B

explanation — for #1, i think of each jar is 7/4, and each pizza is 1/4. so, you would be dividing 7/4 equally amongst 1/4s (each mini pizza.). and for #2, 2 cups as a compatible fraction would be 6/3. 6/3 divided among 1/3 cups ( 1/3 for each pizza) you would get 6.

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NikAS [45]

Answer:

$0.376-2.145\frac{0.0012}{\sqrt{15}}=0.375$

$0.376+2.145\frac{0.0012}{\sqrt{15}}=0.377$

And we are 95% confident that the true mean of chloride concentration is between 0.375 and 0.377 cc/ cubic meter

Step-by-step explanation:

Data provided

$\bar X=0.376$ represent the sample mean for the chloride concentration

$\mu$ population mean (variable of interest)

s=0.0012 represent the sample standard deviation

n=15 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

Since we need to find the critical value first we need to begin finding the degreed of freedom

$df=n-1=15-1=14$

The Confidence is 0.95 or 95%, the significance would be $\alpha=0.05$ and $\alpha/2 =0.025$ , and the critical value for this case with a t distribution with 14 degrees of freedom is $t_{\alpha/2}=2.145$