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zmey [24]
3 years ago
14

Helene claimed that the expected value when rolling a fair die was 3.5. Steve said that wasn't possible. He said that the expect

ed value was the most likely value in a single roll of the die, and since it wasn't possible for a die to turn up with a value of 3.5, the expected value couldn't possibly be 3.5. Who is right
Mathematics
1 answer:
Nesterboy [21]3 years ago
4 0

Answer:

Helene is right

Step-by-step explanation:

Mathematically, the expected values is defined as the sum of all the possible outcomes that an event can have times the probality of the respective outcome:

x = ∑ p *i,

where x is the expected value, i represents every outcome that can occur, and p is the probability of said outcome.

Now, for the case of a dice, the expected value would be:

x = 1 * \frac{1}{6} + 2 * \frac{1}{6} + 3 * \frac{1}{6} + 4 * \frac{1}{6} + 5* \frac{1}{6} + 6 * \frac{1}{6},

as every outcome has the same chance of happenning. Solving we get that:

x= \frac{1}{6} *(1 +2 +3 +4+5+6) = \frac{1}{6} * 21 = 3.5

Helene is right.

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PLZ HELP!!!! WILL MARK BRAINLEST IF CORRECT
OverLord2011 [107]

Answer: the answer is 54

Step-by-step explanation: The error in the expression was that it was multiplied by 1 so it can't be one unless it was also 1 and it's not it is 54.

8 0
3 years ago
What is the value of 4 2/3 divided by 2/5
Nitella [24]
4 2/3 /2 /5
14/3 / 2/5 cross multiply 
7/3 / 1/5 multiply 7 and 5 and 3 and 1
35/3 simplify
11 2/3
6 0
3 years ago
What is the value of X? <br><br><br> A. 5 <br><br> B. 2.5<br><br> C. 7.5<br><br> D. 10
lawyer [7]

Answer:

12. 5

11.

10

10

15. 7

14. 11

2

=

16

16

18. 3

+

11

17

3

4

co

loo

8

Step-by-step explanation:

12. 5

11.

10

10

15. 7

14. 11

2

6 0
2 years ago
A spinner is divided into 10 equal parts and numbered from 1 through 10. What is the probability of spinning a number less than
konstantin123 [22]

Answer:

7/10 * 1/2 = 7/20

Step-by-step explanation:

\frac{7}{10} * \frac{5}{10} \\\frac{7}{10} * \frac{1}{2} \\\frac{7}{20}

3 0
3 years ago
Seven people are in an elevator which stops at ten floors. In how many ways can they get off the elevator?
zlopas [31]

The number of ways people can get off the elevator is 604800 ways.

In this question,

Number of people, n = 7

Number of floors, r = 10

The first person can leave elevator in one of 10 ways. Then second person has to choose from one of remaining 9 floors. Then third person in 8, fourth in 7 ways and so on.

Number of ways people can get off the elevator can be calculated as

⇒ nP_r=\frac{n!}{(n-r)!}

⇒ 10P_{7}=\frac{10!}{(10-7)!}

⇒ 10P_{7}=\frac{10!}{(3)!}

⇒ 10P_{7}=\frac{(10)(9)(8)(7)(6)(5)(4)3!}{(3)!}

⇒ 10P_{7}=(10)(9)(8)(7)(6)(5)(4)

⇒ 604800 ways.

Hence we can conclude that the number of ways people can get off the elevator is 604800 ways.

Learn more about number of ways here

brainly.com/question/27992615

#SPJ4

4 0
2 years ago
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