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
MissTica
3 years ago
6

A school choir has 80 students; 36 of them are in seventh grade. Also, 40 students in the choir are girls; 18 of them are in sev

enth grade. What is the probability that a student picked at random from the choir is either a girl or is in seventh grade?
A.
`27/40`

B.
`29/40`

C.
`13/40`

D.
`33/40`
Mathematics
2 answers:
Sati [7]3 years ago
7 0
B. 29/40

40-18=22
22+36=58/80
58/2=29
80/2=40
FrozenT [24]3 years ago
4 0

Answer:

B.  `29/40`

Step-by-step explanation:

These events are not mutually exclusive.  This means they can happen at the same time.

For two events A and B that are not mutually exclusive,

P(A or B) = P(A)+P(B) - P(A and B)

Our events are:

P(girl or 7th grade) = P(girl)+P(7th grade)-P(girl and 7th grade)

There are 40 girls out of 80 students:

P(girl or 7th grade) = 40/80+P(7th grade)-P(girl and 7th grade)

There are 36 7th graders in the choir out of 80 students:

P(girl or 7th grade) = 40/80+36/80-P(girl and 7th grade)

There are 18 7th grade girls in the choir:

P(girl or 7th grade) = 40/80+36/80-18/80 = 76/80-18/80 = 58/80

Both the numerator and denominator are divisible by 2:

(58÷2)/(80÷2) = 29/40

You might be interested in
How to round 65.85 to the nearest tenth
Contact [7]
Ok if the number behind the decimal is 4-0... round down, But if the number is 5-9 round up.

Example:65.85

The number behind the decimal is a 8.. So round this number up to the next availible whole number, which is 66.
7 0
3 years ago
Read 2 more answers
The least common multiple of 3, 4, 6, and 8 is <br> A. 72.<br> B. 24.<br> C. 96.<br> D. 8.
Maslowich
The least common multiple of 3, 4, 6, and 8 is 24.

List the multiples out:

3: 3, 6, 9, 12, 15, 18, 21, 24
4: 4, 8, 12, 16, 20, 24
6: 6, 12, 18, 24
8: 8, 16, 24
5 0
3 years ago
Read 2 more answers
A parallelogram is a four-sided figure
stellarik [79]
The sum of the parallelogram is 22 because I did the test
4 0
2 years ago
What is the slope of a line passing through the points (-1,-4) and (2,2)
Natali [406]

Answer:

m=2  <em>(slope = 2)</em>

6 0
2 years ago
In 2010 the town of Applewood had an estimated population of 22,000 people, and its annual growth rate was estimated to be 1.8%.
sladkih [1.3K]

Answer:

The answer in the procedure

Step-by-step explanation:

Let

P------> the population of Applewood

n-----> the number of years since 2010

we have

P(n)=22,000(1.018^{n})

using a graphing tool

see the attached figure

Verify each conclusion

a) The population of Applewood, P(n), equals 0 when n = 0

The conclusion is No

For n=0

The population is equal to P(0)=22,000 people

b) The behavior of the left end of the graph flattens out indicating that as n approaches negative infinity the population of Applewood approaches 0

The conclusion is Yes

see the graph

c) The behavior of the right end of the graph is upward indicating that as n approaches infinity the population of Applewood approaches infinity

The conclusion is Yes

see the graph

6 0
2 years ago
Other questions:
  • Correct answers only please!
    5·2 answers
  • Please help<br> Thanks!
    5·1 answer
  • What patterns can you find between the coordinates of any point located in Quadrant one and coordinates of any Point located in
    6·1 answer
  • Select the sets of data where it would be better to use a histogram than a
    9·1 answer
  • Combine like terms. 5/6x - 2/3x A. 1/6x B. 1/3x C. 1/2x D. x
    7·1 answer
  • Please help! I will mark you as brainliest!
    5·2 answers
  • Look at this picture and help me out please
    9·2 answers
  • What is the steps to solve f(x)=x^2
    9·1 answer
  • The length of a rectangle is 8 feet more than its width. If the width is increased by 4 feet and the length is decreased by 5 fe
    12·1 answer
  • what is the surface area of a triangular pyramid if the base is 12 by 12 and each triangle is 12 by 15?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!