Answer: We are 95% confident that the mean SPF level of sunscreen used by all Cal Poly students is between 29.0813 and 40.0187.
Step-by-step explanation:
Given : Significance level : 
Sample size : n= 52 , which is a large sample (n>30), so we use z-test.
By using z-value table,
Critical value: 
Sample mean : 
Standard deviation : 
The confidence interval for population means is given by :-

i.e. 

Now, the 95% confidence interval for the ppopulation mean = . (29.0813, 40.0187)
Hence, We are 95% confident that the mean SPF level of sunscreen used by all Cal Poly students is between 29.0813 and 40.0187.
Answer:
4 bottles
Step-by-step explanation:
Given


Required
Determine the number of bottles
Represent the number of bottles with N
<em>This implies that N bottles of </em>
<em> fit into </em>
<em> of fertilizer. The relationship between them is:</em>
<em></em>


Multiply through by 8




<em>Hence, there are N = 4</em>
Answer:
Step-by-step explanation:
Answer:
x
Step-by-step explanation:
x^5
---------
x^4
When we divide exponents with the same base, we can subtract the exponents
x^(5-4)
x^1
x
2450 is the correct answer because if you multiply 3500 x .70 then you get 2450. Hope this helped