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
Lena [83]
1 year ago
10

20 friends compared the number of text messages they sent in a day. The results are represented in the table below:

Mathematics
1 answer:
pishuonlain [190]1 year ago
6 0

Answer:

4

Step-by-step explanation:

Add up all the numbers in the frequency table then whatever your mean average is divide that by 5 because there are 5 numbers.

2+4+5+8+1

20/5=4

You might be interested in
Help me out plz geometry
Leviafan [203]

Answer:

45°

Step-by-step explanation:

divide 90 by 2 see there is a right angle between them

6 0
3 years ago
Find the area of the larger segment whose chord is 8" long in a circle with an 8" radius. (Hint: A chord divides a circle into t
almond37 [142]
The answer to the problem "Find the area of the larger segment whose chord is 8" long in a circle with an 8" radius" is A = (160/3 π + 16 √3) inches². Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.  
3 0
3 years ago
What is meant by the net change colum of a stock listing
Anuta_ua [19.1K]
Bsjzizduxshrrhxtxobuc hcz
5 0
3 years ago
A number is multiplied by 10 , and that product is added to 5 . The sum is equal to the product of 5 and 5 . Find the number.
mote1985 [20]
2
product of 5 and 5= 25
take 25 and subtract the 5 and u get 20
20 divided by 10 is 2
5 0
2 years ago
5.2.14. For the negative binomial pdf p (k; p, r) = k+r−1 (1 − p)kpr, find the maximum likelihood k estimator for p if r is know
Volgvan

Answer:

\hat p = \frac{r}{\bar x +r}

Step-by-step explanation:

A negative binomial random variable "is the number X of repeated trials to produce r successes in a negative binomial experiment. The probability distribution of a negative binomial random variable is called a negative binomial distribution, this distribution is known as the Pascal distribution".

And the probability mass function is given by:

P(X=x) = (x+r-1 C k)p^r (1-p)^{x}

Where r represent the number successes after the k failures and p is the probability of a success on any given trial.

Solution to the problem

For this case the likehoof function is given by:

L(\theta , x_i) = \prod_{i=1}^n f(\theta ,x_i)

If we replace the mass function we got:

L(p, x_i) = \prod_{i=1}^n (x_i +r-1 C k) p^r (1-p)^{x_i}

When we take the derivate of the likehood function we got:

l(p,x_i) = \sum_{i=1}^n [log (x_i +r-1 C k) + r log(p) + x_i log(1-p)]

And in order to estimate the likehood estimator for p we need to take the derivate from the last expression and we got:

\frac{dl(p,x_i)}{dp} = \sum_{i=1}^n \frac{r}{p} -\frac{x_i}{1-p}

And we can separete the sum and we got:

\frac{dl(p,x_i)}{dp} = \sum_{i=1}^n \frac{r}{p} -\sum_{i=1}^n \frac{x_i}{1-p}

Now we need to find the critical point setting equal to zero this derivate and we got:

\frac{dl(p,x_i)}{dp} = \sum_{i=1}^n \frac{r}{p} -\sum_{i=1}^n \frac{x_i}{1-p}=0

\sum_{i=1}^n \frac{r}{p} =\sum_{i=1}^n \frac{x_i}{1-p}

For the left and right part of the expression we just have this using the properties for a sum and taking in count that p is a fixed value:

\frac{nr}{p}= \frac{\sum_{i=1}^n x_i}{1-p}

Now we need to solve the value of \hat p from the last equation like this:

nr(1-p) = p \sum_{i=1}^n x_i

nr -nrp =p \sum_{i=1}^n x_i

p \sum_{i=1}^n x_i +nrp = nr

p[\sum_{i=1}^n x_i +nr]= nr

And if we solve for \hat p we got:

\hat p = \frac{nr}{\sum_{i=1}^n x_i +nr}

And if we divide numerator and denominator by n we got:

\hat p = \frac{r}{\bar x +r}

Since \bar x = \frac{\sum_{i=1}^n x_i}{n}

4 0
3 years ago
Other questions:
  • Please solve part h you have to find thr value of x
    15·1 answer
  • 2x − 1/4 (12x + 4) = 3
    10·2 answers
  • For which value of x must the expression 91x be further simplified? A) 5 B) 13 C) 15 D) 17 E) 19
    8·1 answer
  • WHOEVER MAKES ME LAUGH WITH THE BEST MEME WINS
    7·2 answers
  • Player pays a fee, then reaches into a large jar and picks out a ball. The jar contains one ball for each letter of the alphabet
    11·1 answer
  • IJ || HK. Find GH.<br> Help plz...No links!! I will report!!
    7·1 answer
  • On a coordinate plane, triangle G H J has points (1, 1), (4, 1), (4, 5).
    14·1 answer
  • What is the equation of the line graphed below?
    14·1 answer
  • What is the initial value of the equation shows y= -2x - 5
    6·1 answer
  • NEED HELP PLEASE I need number 3 and 4 please if anybody can help
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!