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
Andrej [43]
3 years ago
9

Some of the children at a school arrive by car.

Mathematics
1 answer:
scZoUnD [109]3 years ago
8 0

Answer:

  • <u>74%</u>

Explanation:

You can build a two-way relative frequency table to represent the data:

These are the columns and rows:

               Car         No car      Total

Boys

Girl

Total

Fill the table

  • <em>30% of the children at the school are boys</em>

             Car         No car      Total

Boys                                       30%

Girl

Total

  • <em>60% of the boys at the school arrive by car</em>

That is 60% of 30% = 0.6 × 30% = 18%

             Car         No car      Total

Boys      18%                         30%

Girls

Total

By difference you can fill the cell of Boy and No car: 30% - 18% = 12%

             Car         No car      Total

Boy       18%           12%         30%

Girl

Total

Also, you know that the grand total is 100%

             Car         No car      Total

Boy       18%           12%         30%

Girl

Total                                     100%

By difference you fill the total of Girls: 100% - 30% = 70%

             Car         No car      Total

Boy       18%           12%         30%

Girl                                         70%

Total                                     100%

  • <em>80% of the girls at the school arrive by car</em>

That is 80% of  70% = 0.8 × 70% = 56%

             Car         No car      Total

Boy       18%           12%         30%

Girl       56%                         70%

Total                                     100%

Now you can finish filling in the whole table calculating the differences:

             Car         No car      Total

Boy       18%           12%         30%

Girl        56%         14%         70%

Total     74%          26%      100%

Having the table completed you can find any relevant probability.

The probability that a child chosen at random from the school arrives by car is the total of the column Car: 74%.

That is because that column represents the percent of boys and girls that that  arrive by car: 18% of the boys, 56% of the girls, and 74% of all the the children.

You might be interested in
Giúp tớ giải bài toán này với
vampirchik [111]

Answer:

english pls

Step-by-step explanation:

6 0
2 years ago
How do you to tell the difference between an ellipse, hyperbola, parabola, or circle if all are in standard form?
NeX [460]

Step-by-step explanation:

General form of a conic section is:

Ax² + Bxy + Cy² + Dx + Ey + F = 0

If B = 0:

Parabola: Either x² or y² term, but not both

Circle: x² and y² have the same coefficient

Ellipse: x² and y² have different positive coefficients

Hyperbola: x² and y² have different signs

Otherwise, look at the discriminant.

If B² − 4AC < 0, then the conic is an ellipse.

If B² − 4AC = 0, then the conic is a parabola.

If B² − 4AC > 0, then the conic is a hyperbola.

6 0
2 years ago
What must the value of x be, so that a parallel to b, m∠2 = 70°, and m∠7=(3x + 10)°?
Ksju [112]
70=3x+10
Subtract 10 from both sides
60=3x
Divide both sides by 3
20=x
x=20
5 0
3 years ago
Needs to be written in scientific notation. please help me.
LuckyWell [14K]
5.2 x 10^-3 - 2.58 x 10^-3  Since the exponents on the 10 part is the exact same you can just subtract the number parts

5.2 - 2.58 = 2.62

Add the x 10^-3 back to it and get 2.62 x 10^-3
5 0
2 years ago
I don't understand, can someone please help?
antoniya [11.8K]

Answer: It wants you to find the "Lateral Surface Area" or as I call it the area of the dimensional figures sides.

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • The prime factorization of 324 can be written as 2^a x 3^b, where a = and b=
    5·1 answer
  • THERE ARE 3 BAGS OF APPLES WEIGHING A TOTAL OF 22 1/2 POUNDS. TWO OF THE BAGS WEIGH 6 3/8 POUNDS AND 3 1/4 POUNDS. HOW MUCH DOES
    12·1 answer
  • What is the value of x ?
    15·1 answer
  • What is the measure of A?
    11·2 answers
  • the scale for Maria's toy car collection is 1:8. if a toy car in her collection is 7 1/2 inches long, how long is the actual car
    15·1 answer
  • Pleaseeeee answer correctly !!!!!!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!!
    5·1 answer
  • As a marketing manager, you are tasked with selecting a website to place your advertisement. The following sampled data shows th
    9·1 answer
  • What is two thirds divided into 3
    14·1 answer
  • Find the slope of the line that passes through (4, 4) and (9, 1).
    6·2 answers
  • The angle marked a = 79°.<br> Work out the value of x.<br><br> The diagram is not drawn accurately.
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!