Answer:
No, Mr. Hernandez’s sample is random, not biased, large enough compared to the population, but 28 is not 20% of 90.
Step-by-step explanation:
At Lawson Middle School, Mr. Hernandez asked 90 randomly selected students from each grade level for their favorite subject.
90 randomly selected students from each grade level for their favorite subject, and 28 chose social studies as their favorite.
so, the percent of students who love social studies is given by:
28/90 x 100=31.11%
He used this data to draw the inference that out of the 250 middle school students, about 20% prefer social studies.
No, Mr. Hernandez’s sample is random, not biased, large enough compared to the population, but 28 is not 20% of 90.
All u have to do is 20.28-2.80 and then divide
It seems to be none of the above
Answer:
48 sq. in.
Step-by-step explanation:
Different figures (rectangular prisms, cylinders, triangular prisms etc.) have different volume formula. But what formula of "volume" do they come from??
It is:
Volume = Area of Base * Height
<u>Note:</u> we didn't specify any Area of Base formula because it depends. If base is circle, the area is different than if base was suppose a square. But this is the general formula of volume.
Now,
Given
Height = 18 inch
Volume = 864 cubic inch
We can write:
Volume = Area of Base * Height
864 = Area of Base * 18
Thus,
Area of Base = 864/18 = <u>48 sq. in.</u>
<u>This is what we are wanting, "area of base" (irrespective of the shape).</u>
Answer:
a 1/7
Step-by-step explanation:
The given proprty is
a 1/n = n√a ...(i)
The given expression is
7√a ...(ii)
on comparing (i) and (ii), we get
n = 7
Using (i) the given expression can be written as
7√a = a 1/7
Therefore, the required expression is
a 1/7