1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Svetlanka [38]
3 years ago
13

I'm so confused please help

Mathematics
2 answers:
Darya [45]3 years ago
8 0

Answer:

84.3%

Step-by-step explanation:

Total frequency is the total area:

Add all the areas

To find each area:

Frequency density × class width

Total frequency:

40×10 + 30×10 + 25×20 + 15×5

= 1275

Less than 40:

Bar 1 + Bar 2 + some part of Bar 3

40×10 + 30×10 + 25×15

= 1075

Percentage (<40) = 1075/1275 × 100

= 4300/51

= 84.31372549%

Hatshy [7]3 years ago
6 0

I'm confused too and I'm supposed to be an expert.  I'm not entirely sure what frequency density is.  We'll just treat this as a histogram.

Let's assume each five minute interval gives a value equal to or proportional to the number of people that finished in that interval.

From 0 to 50 we have 10 intervals; let's just make this into a table

0-5  0

5-10 40

10-15 40

15-20 30

20-25 30

25-30 25

30-35 25

35-40 25

40-45 25  

45-50 15


From 0 to 40 that adds up to

0+40+40+30+30+25+25+25 = 215

From 0 to 50 that's

215+25+15 = 255

The fraction less than 40 is 215/255 = 43/51 ≈ .843

Answer: 84.3%


You might be interested in
C increased by 8 can I get help
Brums [2.3K]

Answer:

the answer based on the information provided is c + 8

Step-by-step explanation:

8 added to C is c + 8, since they are unlike terms

3 0
2 years ago
Use the given equation to complete the table: s = 16 t squared t (sec) s(ft) 0 1 2 3 Using the points from the table select the
dalvyx [7]

Answer:

a 0, 16, 64,144 graph A edge

Step-by-step explanation:

5 0
3 years ago
What are the next three terms 4, 7/4,-1/2,-11/4...
Molodets [167]

Answer:

{-29/4, -19/2, -47/4}

Step-by-step explanation:

Note that this is a decreasing arith. seq.  Each term is smaller than the previous term, the result of the subtraction of 2 1/4 (equivalent to 9/4).  

The fourth term is -11/4; subtracting 9/4 results in -20/4, or -5.

The fifth term is -20/4; subtracting 9/4 results in -29/4.

The 6th term is -29/4; subtracting 9/4 results in -38/4, or -19/2.

The 7th term is -38/4; subtracting 9/4 results in -47/4.

Thus, the "next three terms" following the first four terms are {-29/4, -19/2, -47/4}

5 0
3 years ago
A number which precedes a variable and that can be expressed in the form a/b (where a and b are integers) is called a ___ coeffi
Vadim26 [7]

The answer is: Rational coefficient.

The explanation for this answer is shown below:

1. By definition, a rational number has the form \frac{a}{b} where a is the numerator and b is the denominator. The numerator and the denominator are integers.

2. By definition, integers numbers includes positive numbers, negative numbers and zero.

3. Keeping the information above on mind, you can conclude that the answer is: Rational coefficient.

4. For example:

\frac{1}{3}x

\frac{1}{3} is a rational coefficient.

7 0
3 years ago
Read 2 more answers
Given that D is he midpoint of AB and K is the midpoint of BC, which statement must be true?
Reil [10]
I can't understand your question do you have any number there?
3 0
2 years ago
Other questions:
  • Jjnsdljdgfjdfdlngslkdb
    9·1 answer
  • If 2/5x = y + 7, which expression has a value of 35?
    6·1 answer
  • -4c + 12 10 Write a simplified expression to represent the perimeter (p) of the rectangle. A -8C + 44 B -4c +22 C -8c + 120 D-40
    12·1 answer
  • A skating rink charges a group rate of $9.25 plus a fee to rent each pair of skates. A family rents 7 pairs of skates and pays a
    15·1 answer
  • it say look at the bar diagram. what term refers to the amount joshua has to pay back in addition to the $300 he borrows? 7th so
    13·1 answer
  • The diameter of a cylindrical propane gas tank is 10 feet. The total volume of the tank is 4712.4 cubic feet. Find the length of
    12·1 answer
  • If a function has a rule of y=5x+2 what is the output when the input is 4
    7·1 answer
  • Explain why the order of the coordinates does not matter when calculating length in geometry?
    9·2 answers
  • I need to know the answer
    6·1 answer
  • HELP PLEASE 25 POINTS
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!