The frequency of revision times is given by the product of the frequency
density value and the class width.
Correct response:
- The number of students are <u>72 students</u>
<h3>Methods of calculation using a histogram</h3>
The estimate of the number of students who revised for less than 45
minutes is given by the area, <em>A,</em> under the histogram to the left of the 45
minute mark as follows;
Frequency, f = Frequency density × Class width
Number of students = ∑f
Therefore;
A = 5 × 2 + 10 × 2.2 + 20 × 1.6 + 10 × 0.8 = 72
- The number of students that revised for less than 45 minutes = <u>72 </u>students
Learn more about histograms here:
brainly.com/question/17139138
<span>1. What is the area of this figure?
Enter your answer in the box.
A = (5x5) + 1/2(4)(5)
A = 25 + 10
A = 35
answer
35 cm²
--------------
</span><span>2. What is the measure of angle x?
Enter your answer in the box.
x = 90° - 47
x = 43</span>°
The equation that represents the mathematical statement is 2^x + 1 = 21
<h3>How to determine the equation?</h3>
The statement is given as:
Two to the second power +1 equals 21
Equals mean =
So, we have:
Two to the second power +1 = 21
Two to the second power means 2^x, where x is the variable.
So, we have
2^x + 1 = 21
Hence, the equation that represents the statement is 2^x + 1 = 21
Read more about equations at:
brainly.com/question/2972832
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Answer:
768 tiles would be required to tile the floor.
Step-by-step explanation:
Let's first calculate the number of square meters that the rectangular floor represents, by using the formula for the area of a rectangle (length x width):
Floor area = 8 m x 6 m = 48 ![m^2](https://tex.z-dn.net/?f=m%5E2)
Next, let's convert the side of the square tiles into meters in order to keep the same units in both (floor area an tile area):
25 cm = 0.25 m
Then the are of a square tile can be obtained by the formula 0.25 m x 0.25 m = 0.0625 ![m^2](https://tex.z-dn.net/?f=m%5E2)
Now to find the number of tiles needed, we perform the division of the total floor area to be covered divided by the area covered by a single tile:
Number of tiles needed: 48
/ 0.0625
= 768 tiles