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
aliya0001 [1]
3 years ago
9

You have 10 batteries sitting on your desk, three of which are dead. You choose 2 batteries are random for you calculator. What

is the expected number of good batteries that you get?
A) 0

B) 1

C) 1.4

D) 2
Mathematics
1 answer:
Ipatiy [6.2K]3 years ago
7 0

Answer:

C) 1.4

Step-by-step explanation:

The probability of choosing 2 good ones is 7/10·6/9 = 42/90.

The probability of choosing 1 good one is 7/10·3/9 +3/10·7/9 = 42/90.

The probability of choosing 0 good ones is 3/10·2/9 = 6/90

The expected value is the sum of the product of number of good ones and their probability:

... 2·42/90 +1·42/90 +0·6/90 = (2+1)·42/90 = 42/30 = 1.4

You might be interested in
I don't understand how to solve this ​
pashok25 [27]

Answer:

i think you need to solve the formula from the inside the parenthesis first then you would have to find the absolute value.

Step-by-step explanation:

4 0
3 years ago
Please please help I am stuck and idk I tried so many times.
zhuklara [117]

Answer:

58.8 in^2

Step-by-step explanation:

The area of triangle given two sides and included angle.

8 0
3 years ago
There are 40 nickels in a roll. If you have 250 rolls of nickels, how many nickels do you have?pls help me
gayaneshka [121]

Answer:

10,000 nickles

Step-by-step explanation:

Since there are 40 nickles in a roll and you have 250, think that you have 250 sets of 40. This means that this question is a multiplication problem.

Multiply 40 x 250. This would give you 10,000.

Don't forget units.

7 0
3 years ago
Read 2 more answers
I need help with 8th grade math please hurry and correct answer please 40 points
scoundrel [369]

Answer:

2664.3

Step-by-step explanation:

The volume of a sphere is

V = 4/3 πr³

Multiply the radius (which is the diameter divided by 2), 8.6 by itself 3 times, and them multiply it by pi and 4/3 to achieve a volume of 2664.31 or aproximatley 2664.3.

8 0
2 years ago
Read 2 more answers
Mason opens a savings account by making a $165.85 deposit. Every week, he deposits another $20.50 in the account. The following
monitta

Answer:

370.85

Step-by-step explanation:

20.50×10. +165.85=

4 0
3 years ago
Read 2 more answers
Other questions:
  • The population of a large city, x, is less than 8 million. Which inequality correctly represents the statement?
    11·1 answer
  • If you drive a vehicle that will run 35 miles on one gallon of octane and you drive 10,000 miles per year how many metric tons o
    11·1 answer
  • What is the sum and classification of 3/20+divided by 10
    14·1 answer
  • Find the percent of the quantity 0.5% of12
    15·2 answers
  • A wheel with a diameter of 25 in. is in a puddle of water 8.1 in. deep. What is the width of the wheel, AB, at the surface of th
    15·1 answer
  • you spent half of your weekly allowance at the movies. to earn more money your parents let you wash the car for $8. what is your
    7·1 answer
  • Identify the domain of the function shown in the graph.
    10·1 answer
  • . Graham bought 45 bags of potatoes. Each bag weighed exactly 4pounds.How many pounds of potatoes did he buy?
    11·1 answer
  • Evaluate f(x) = x + 8 when x = -3, 0, and 5.
    7·1 answer
  • Gabby and Brea went shopping at Ciara's Clothing Goods. Gabby bought 2 shirts and 1 pair of shoes, and she spent $32. Brea bough
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!