Answer:
151 students must be selected.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
That is z with a pvalue of , so Z = 1.96.
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
The population standard deviation is known to be $25.
This means that
How many students must be randomly selected to estimate the mean weekly earnings of students at one college? Sample mean within $4 of the population mean
This is n for which M = 4. So
Rounding up:
151 students must be selected.
Answer:
34a + 12
Step-by-step explanation:
Perimeter = sum of the sides
= 2(6a + 8) + 12a + 10a - 4
= 12a + 16 + 12a + 10a - 4
= 34a + 12 (answer}
The figure can be splitted into 2 trapeziums.
Hence, 14.5 * 16 + 20 * 10 = 432.
solving the expression we get the value 17
Step-by-step explanation:
We need to solve the following expression:
We will solve the expression using precedence rules in Maths.
First we will solve round brackets ()
Now we will solve the square brackets []
Now we will solve curly bracket {}
Now according to DMAS(division,multiplication,addition,subtraction) rule, we will first do multiplication and then subtraction
So solving the expression we get the value 17
Keywords:Solving expressions
Learn more about Solving expressions at:
#learnwithBrainly
Answer:
I am s e x y right you want to go out one day
2121
Step-by-step explanation: