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
cricket20 [7]
3 years ago
6

Jack rolls a number cube twice. What is the probability that the sum of the 2 rolls is less than 8 given that the first roll is

a 4?
one over two

one over six

one over three

five over six
Mathematics
2 answers:
disa [49]3 years ago
8 0
If the first roll is a 4, the possibilities to add less than 8 are that the second cube roll is 1, 2 or 3.

These are 3 different events out of 6 possilbe ones, which is 3 / 6 = 1 / 2; i.e. half of times.

Then the answer is the first option: 1 / 2
nevsk [136]3 years ago
3 0

Answer:  The correct option is (a) one over two.

Step-by-step explanation:  Given that Jack rolls a number cube twice. We are to find the probability that the sum of the 2 rolls is less than 8 given that he first roll is a 4.

A cube rolls 1, 2, 3, 4, 5 and 6. So, the sample space will be

S = {1, 2, 3, 4, 5, 6}.

That is, n(S) = 6.

Since the first roll is a 4, so the options for the second roll are 1, 2 and 3 so that the sum is less than 8.

Therefore, if 'A' is the event that the sum is less than 4, then

A = {1, 2, 3}.

That is, n(A) = 3.

So, the probability of happening of event A is given by

P(A)=\dfrac{n(A)}{n(S)}=\dfrac{3}{6}=\dfrac{1}{2}.

Thus, the required probability is one over half.

Option (a) is correct.

You might be interested in
46. Merchandising If 12 items are in a dozen, 12 dozen are in a gross, and 12 gross are in a great-gross, how many items are in
Andrews [41]

Answer: 1728

Step-by-step explanation: You multiply 12 times 12 because we have to find how many items are in a 12 dozen first which is 144 because there are 12 items in one dozen.  We already know that there are 144 items in 12 dozens and there are 12 dozens in a gross, which is 144 items in total. Now we have to multiply 144 times 12 to find how many items are in a great gross. 144 times 12 is 1728.

3 0
3 years ago
Look at the picture below please
Phantasy [73]

Answer:

  1. 1.73205080757
  2. 4.58257569496
  3. 7.87400787401

8 0
3 years ago
I really need help please and thankyou
Jet001 [13]

Answer:

answer is (d) 4/3

Step-by-step explanation:

-x+3/7=2x-25/7

25/7+3/7=2x+x

28/7=3x

4=3x

x=4/3

7 0
3 years ago
a car moves with the speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 5 minutes find the total dist
Gekata [30.6K]

Answer: 8

Step-by-step explanation:

Umm idk

4 0
3 years ago
pls help . Select all the pairs that could be reasonable approximations for the diameter and circumference of a circle. Explain
Grace [21]
i don’t know hopefully you do good tho
4 0
2 years ago
Read 2 more answers
Other questions:
  • What is the degree measure of x in this triangle?
    10·1 answer
  • Need help one step equations multiplication and Division
    9·1 answer
  • The expression below represents the number of bacteria in a petri dish after t hours.
    10·2 answers
  • Originally 21 acts were tentatively to perform at the arena ; only 10 have been booked. What is the shortfall if the other acts
    7·2 answers
  • How can I solve this equation X-5=0.1(x+5)
    13·2 answers
  • CAN SOMEONE JUST PLEASE ANSWER THIS ASAP FOR BRAINLIEST!!!
    11·1 answer
  • Simplify the expression. If not possible write simplified. 3x+7(3x+4)
    10·1 answer
  • What is nine time nine​
    8·1 answer
  • I'm failing math. I need help
    5·1 answer
  • 5 less is less than 25 by what percent
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!