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
SSSSS [86.1K]
3 years ago
8

Radio stations in a certain country use a sequence of 5 or 6 letters as their station identification call letters. The first let

ter must beZ or K or B . Assume there are no restrictions on the remaining​ letters, and repetition is allowed.
​a) How many 5​-letter station identifications are​ possible?
​b) How many 6​-letter station identifications are​ possible?
​c) How many total station identifications are​ possible?
​d) The identification for a​ randomly-chosen radio station is 5 letters in length. What is the probability that all 5 letters are​ different?
Mathematics
1 answer:
liubo4ka [24]3 years ago
3 0
A is the answer to your question
You might be interested in
This is a math question if you are good this is good for you this is hard
lubasha [3.4K]

Answer:

Hope this helps!

Step-by-step explanation:

1- -24

2- -23

3- -2

4- 11

5- 5

6- -3

7- 28

8- 120

7 0
3 years ago
G.O has 3 orange picks for every 2 green. If there are 25 picks in all, how many picks are orange?
Tomtit [17]

There will be 15 orange pickles and 10 green picks

3 0
3 years ago
Researchers at the National Cancer Institute released the results of a study that investigated the effect of weed-killing herbic
jolli1 [7]

Answer:

The 95% confidence interval for the difference in the proportion of cancer diagnoses between the two groups is (0.3834, 0.5166).

Step-by-step explanation:

Before building the confidence interval, we need to understand the central limit theorem and subtraction between normal variables.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean \mu = p and standard deviation s = \sqrt{\frac{p(1-p)}{n}}

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

The randomly sampled 400 dogs from homes where an herbicide was used on a regular basis, diagnosing lymphoma in 230 of them.

This means that:

p_h = \frac{230}{400} = 0.575, s_h = \sqrt{\frac{0.575*0.425}{400}} = 0.0247

Of 200 dogs randomly sampled from homes where no herbicides were used, only 25 were found to have lymphoma.

This means that:

p_n = \frac{25}{200} = 0.125, s_n = \sqrt{\frac{0.125*0.875}{200}} = 0.0234

Distribution of the difference:

p = p_h - p_n = 0.575 - 0.125 = 0.45

s = \sqrt{s_h^2+s_n^2} = \sqrt{0.0247^2 + 0.0234^2} = 0.034

Confidence interval:

The confidence interval is:

p \pm zs

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

The lower bound is 0.45 - 1.96(0.034) = 0.3834

The upper bound is 0.45 + 1.96(0.034) = 0.5166

The 95% confidence interval for the difference in the proportion of cancer diagnoses between the two groups is (0.3834, 0.5166).

3 0
3 years ago
Find s(20) for the sequence s(n)=5n-2,ne {1 2, 3,... }
zavuch27 [327]

Answer:

Step-by-step explanation:

c

S(20)=

5*20-2=100-2=98

3 0
3 years ago
A line passes through the points (2, –2) and (–6, 2). The point (a, –4) is also on the line. What is the value of a?
Murljashka [212]

Answer:

6

Step-by-step explanation:

I took the test

5 0
3 years ago
Read 2 more answers
Other questions:
  • Factor each completely 3r^2+7r
    9·2 answers
  • Please tell me easy way I can solve for the answer
    12·1 answer
  • The temperature was -3°F<br> ast night. It is now -14°F.<br> What was the change in<br> emperature?
    8·2 answers
  • If G (x) = 1/x were shifted 2 untold to the left and 2 united up, what would the new equation be?
    12·1 answer
  • I need with help with the similarities between triangles
    7·2 answers
  • Use Stokes' Theorem to evaluate C F · dr where C is oriented counterclockwise as viewed from above. F(x, y, z) = xyi + yzj + zxk
    6·1 answer
  • Which quotient is greater than 3?<br><br> 42 ÷ 19<br> 40 ÷ 18<br> 38 ÷ 14<br> 36 ÷ 11
    14·1 answer
  • Ab with slope = 5 and ST with slope = 5
    6·1 answer
  • What is the longest side of a right triangle?
    6·1 answer
  • 9. The function h(t) = 150 - 4t represents the height of a person repelling down
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!