Evaluate the expression |2x – 5| for x = –3 and for x = 3.
1 answer:
Answer:
Option A: 11,1 is the correct answer.
Step-by-step explanation:
The absolute value is used in the given expressions.
The absolute value represents the values of a number or variable irrespective of its sign. This means that |x| = x and |-x| = 0
Given expression is:
Putting x=3
Putting x=-3
Hence,
Option A: 11,1 is the correct answer.
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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.