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
Dahasolnce [82]
3 years ago
13

Q7.

Mathematics
1 answer:
VLD [36.1K]3 years ago
3 0

Answer:

10

Step-by-step explanation:

Let c = sum of ages of all children.

mean age of all children = c/15 = 7

c = 15 * 7 = 105

The sum of the ages of all children is 105.

Let b = sum of ages of the 9 boys.

mean age of boys = b/9 = 5

b = 9 * 5 = 45

The sum of the ages of the boys is 45.

The sum of the ages of the girls is c - b.

c - b = 105 - 45 = 60

The number of girls is 15 - 9 = 6

mean age of girls = (sum of ages of the girls)/(number of girls) =

= 60/6 = 10

You might be interested in
Order at the end and help pls ​
Elena L [17]

Answer:

#4- Descending- 9140, 4593, 3401, 1250

#5- Ascending- 1845, 4478, 7324, 9750

3 0
2 years ago
What is the answer to -5(-x + 3)
Vlad1618 [11]

Answer:

the answer iissss.....5x-15

3 0
3 years ago
Read 2 more answers
Need help asap!!! 48 points
Nady [450]

Answer:

b. i think

Step-by-step explanation:

7 0
3 years ago
What is 247,039 rounded to the nearest thousand
omeli [17]
Pretty sure the answer is 247,000
5 0
3 years ago
Read 2 more answers
Consider rolling two fair dice one 3-sided the other 5-sided
Ne4ueva [31]

Since the dice are fair and the rolling are independent, each single outcome has probability 1/15. Every time we choose

1\leq x\leq 3,\quad 1\leq y \leq 5

We have P(X=x)=\frac{1}{3} and P(Y=y)=\frac{1}{5}, because the dice are fair.

Now we use the assumption of independence to claim that

P(X=x, Y=y) = P(X=x)\cdot P(Y=y) =\dfrac{1}{3}\cdot\dfrac{1}{5} = \dfrac{1}{15}

Now, we simply have to count in how many ways we can obtain every possible outcome for the sum. Consider the attached table: we can see that we can obtain:

  • 2 in a unique way (1+1)
  • 3 in two possible ways (1+2, 2+1)
  • 4 in three possible ways
  • 5 in three possible ways
  • 6 in three possible ways
  • 7 in two possible ways
  • 8 in a unique way

This implies that the probabilities of the outcomes of W=X+Y are the number of possible ways divided by 15: we can obtain 2 and 8 with probability 1/15, 3 and 7 with probability 2/15, and 4, 5 and 6 with probabilities 3/15=1/5

8 0
3 years ago
Other questions:
  • if a man walks his dog for 4 hours total a week, then how many weeks total does it take for him to walk his dog for a total of 4
    11·1 answer
  • carli bought a new pair of jean for $60 if the tax if the tax rate is 8.25% how much will carli have to pay for the jeans includ
    5·1 answer
  • How do you solve this problem?
    15·1 answer
  • Find the inverse function (or relation) of the function f(x) =<br> x - 5.
    12·1 answer
  • I need help with 5a and 5b please!
    15·1 answer
  • (-x-¹y)°
    8·1 answer
  • Suppose you buy flour and cornmeal in bulk to make flour tortillas and corn tortillas. Flour costs $1.50 per pound and cornmeal
    11·1 answer
  • 5x^2-7x=4x^2-10 solve
    6·1 answer
  • Luka is shopping for t-shirts. The first t-shirt costs $18.00, and every t-shirt after the first costs $12.00.
    8·2 answers
  • A box of of trading cards has 24-packs of cards in it. Only two of those packs contain limited edition cards.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!