All categories

3 years ago

Willl mark brainlyist

Mathematics

1 answer:

devlian [24]3 years ago

6 0

Answer: I would think C, 1/11, but think about it though. I don’t know if it is right.

You might be interested in

Assume that when adults with smartphones are randomly selected, 51% use them in meetings or classes. If 7 adult smartphone use

Morgarella [4.7K]

Answer:

$P(X \geq 3) = 1-P(X$

If we find the individual probabilities we gotL

$P(X=0)=(7C0)(0.51)^0 (1-0.51)^{7-0}=0.0068$

$P(X=1)=(7C1)(0.51)^1 (1-0.51)^{7-1}=0.0494$

$P(X=2)=(7C2)(0.51)^2 (1-0.51)^{7-2}=0.1543$

And replacing we got:

$P(X \geq 3) = 1- [0.0068 +0.0494 +0.1543]= 0.7895$

Step-by-step explanation:

Previous concepts

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Solution to the problem

Let X the random variable of interest, on this case we now that:

$X \sim Binom(n=7, p=0.51)$

The probability mass function for the Binomial distribution is given as:

$P(X)=(nCx)(p)^x (1-p)^{n-x}$

Where (nCx) means combinatory and it's given by this formula:

$nCx=\frac{n!}{(n-x)! x!}$

For this case we want to find this probability:

$P(X \geq 3)$

And we can use the complement rule for this case:

$P(X \geq 3) = 1-P(X$

If we find the individual probabilities we gotL

$P(X=0)=(7C0)(0.51)^0 (1-0.51)^{7-0}=0.0068$

$P(X=1)=(7C1)(0.51)^1 (1-0.51)^{7-1}=0.0494$

$P(X=2)=(7C2)(0.51)^2 (1-0.51)^{7-2}=0.1543$

And replacing we got:

$P(X \geq 3) = 1- [0.0068 +0.0494 +0.1543]= 0.7895$

7 0

3 years ago

Determine the two positive integers each square root falls between.

sertanlavr [38]

Answer:

10. (5, 6)

11. (1, 2)

12. (7, 8)

13. (10, 11)

14. (27, 28)

15. (11, 12)

Step-by-step explanation:

If you're not familiar with the squares of small integers, your calculator can help you figure this.

10. √28 ≈ 5.291 . . . . between 5 and 6

11. √3 ≈ 1.732 . . . . between 1 and 2

12. √59 ≈ 7.681 . . . . between 7 and 8

13. √115 ≈ 10.724 . . . between 10 and 11

14. √772 ≈ 27.785 . . . . between 27 and 28

15. √140 ≈ 11.832 . . . . between 11 and 12

5 0

3 years ago

What is the ZERO for the graph?

Serjik [45]

Answer:

that is the orgin which means the middle.

Step-by-step explanation:

5 0

3 years ago

The ratio of boys to girls in grade 8 at robinson middle school is 5:7 if there is 600 students in grade 8 how many are girls

REY [17]

250 boys & 350 girls

7 0

3 years ago

Brad needs to rent a movibg truck. suppose company A charges a rate of $40 per day and Company B charges a $60 fee plus $20 per

Strike441 [17]

Answer:

Day 3

Step-by-step explanation:

A B

1- 40 80 (FOR COMPANY B DON'T ADD 80 EVERY TIME! ADD 20!!)

2-80 100

3-120 120

4-160 140

3 0

3 years ago