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
pashok25 [27]
3 years ago
9

In a statistics class there are 18 juniors and 10 seniors; 6 of the seniors are females and 12 of the juniors are males. If a st

udent is selected at random, find the probability of selecting the following.
a. A junior or a female
b. A senior or a female
c. A junior or a senior
Mathematics
1 answer:
White raven [17]3 years ago
3 0

Answer:

a) 0.857

b) 0.571

c) 1

Step-by-step explanation:

Based on the data given, we have

  • 18 juniors
  • 10 seniors
  • 6 female seniors
  • 10-6 = 4 male seniors
  • 12 junior males
  • 18-12 = 6 junior female
  • 6+6 = 12 female
  • 4+12 = 16 male
  • A total of 28 students

The probability of each union of events is obtained by summing the probabilities of the separated events and substracting the intersection. I will abbreviate female by F, junior by J, male by M, senior by S. We have

  • P(J U F) = P(J) + P(F) - P(JF) = 18/28+12/28-6/28 = 24/28 = 0.857
  • P(S U F) = P(S) + P(F) - P(SF) = 10/28 + 12/28 - 6/28 = 16/28 = 0.571
  • P(J U S) = P(J) + P(S) - P(JS) = 18/28 + 10/28 - 0 = 1

Note that a student cant be Junior and Senior at the same time, so the probability of the combined event is 0. The probability of the union is 1 because every student is either Junior or Senior.

You might be interested in
Answer quick for brainliest
bazaltina [42]

Answer:

y = -1/2x + 4

Step-by-step explanation:

7 0
3 years ago
Honda Atlas issued 100,000 shares of stock. In 1990, each share of stock was worth Rs. 152.50. In 1993, each share of the stock
noname [10]

Answer:

Rs.13,130 ,000

Step-by-step explanation:

Lets solve first for year 1990

Value of stock in 1990 = Rs. 152.50

No. of stocks issued in 1990 = 100,000

Total value of these stocks in 1990= Value of stock in 1990* no of stocks issued in 1990  = 152.50*100,000 = Rs. 15,250,000

Let solve first for year 1993

Value of stock in 1993 = Rs. 21.20

No. of stocks   1993 = 100,000

Total value of these stocks in 1993 = Value of stock in 1993* no of stocks issued in 1993  = 21.20*100,000 = Rs. 2,120,000

Decrease in value of stock in 1993 in comparison to 1990 = Total value of the stocks in 1990 -Total value of the stocks in 1993

 =  Rs. 15,250,000 - Rs. 2,120,000

 = Rs.13,130 ,000

Thus, the 100,000 shares worth Rs.13,130 ,000 lesser in 1993 than in 1990.

6 0
3 years ago
Monday<br> What time is 5 3/4 hours after<br> 11:32 pm?
Marina86 [1]

bearing in mind that the an hour has 15 + 15 + 15 + 15 = 60 minutes, so 15 minutes in 1/4 of an hour, thus 45 minutes is 3/4 of an hour.

now, from 11PM, if we add the 5 hours first, we'll be at 4AM, pass midnight of course.

now let's add the minutes, 32 and then 45, that gives us 77 minutes.

so the time will be 4AM plus 77 minutes, since 60 minutes is 1 hr, so 4AM plus 1 hr and 17 minutes, that'd be 5:17AM.

6 0
3 years ago
Paula a college student earned $3,600 one summer during the following semester she spent $2500 for tuition $650 for rent and $43
Fed [463]
The fraction you are looking for is expenses/earnings 

So (2500+650+434)/3600
=224/225 

If you want to turn this into a percentage just multiply by 100, to give you 99.56%.
3 0
3 years ago
Ok help me please guys ..what is 61=3b+7 ?
Neporo4naja [7]
61 = 3b + 7

3b + 7 = 61

3b = 61 - 7

3b = 54

b = 54/3

b = 18.
7 0
3 years ago
Read 2 more answers
Other questions:
  • Can someone explain to me how to solve these types of problems ? <br> * will mark bainlyest *
    6·1 answer
  • HELP PLEAAESEEEEEEeee
    14·1 answer
  • A line passes through the point and has a slope of -4/3 and (6, -6).
    5·1 answer
  • A recipe for a salad dressing calls for fresh lime juice and honey. The ratio of tablespoons of honey to tablespoons of lime jui
    8·2 answers
  • Which graph represents the function? P2 (With graph choices)
    8·1 answer
  • Bus a leaves the station every 12 minutes Bus b leaves the station every 28 minutes Bus a and Bus b leave the station at 8.00 am
    14·2 answers
  • 7a + b - 12 wich is the coefficient?
    6·2 answers
  • What is the slope of the line?
    11·1 answer
  • Which is a diagonal through the interior of the cube?
    11·2 answers
  • In rectangle GRAM below GA =4×+17 and MR= 7x-4 find the value of x and the lenghts of GA MR
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!