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Helen [10]
2 years ago
13

Select the correct answer.

Computers and Technology
1 answer:
Nady [450]2 years ago
3 0

Answer:

B

Explanation:

In an ERD, the Crow Foot Notation Symbols are used with cardinality.

Hope it helps you

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A computer retail store has 15 personal computers in stock. A buyer wants to purchase 3 of them. Unknown to either the retail st
Dima020 [189]

Answer:

a. 1365 ways

b. Probability = 0.4096

c. Probability = 0.5904

Explanation:

Given

PCs = 15

Purchase = 3

Solving (a): Ways to select 4 computers out of 15, we make use of Combination formula as follows;

^nC_r = \frac{n!}{(n-r)!r!}

Where n = 15\ and\ r = 4

^{15}C_4 = \frac{15!}{(15-4)!4!}

^{15}C_4 = \frac{15!}{11!4!}

^{15}C_4 = \frac{15 * 14 * 13 * 12 * 11!}{11! * 4 * 3 * 2 * 1}

^{15}C_4 = \frac{15 * 14 * 13 * 12}{4 * 3 * 2 * 1}

^{15}C_4 = \frac{32760}{24}

^{15}C_4 = 1365

<em>Hence, there are 1365 ways </em>

Solving (b): The probability that exactly 1 will be defective (from the selected 4)

First, we calculate the probability of a PC being defective (p) and probability of a PC not being defective (q)

<em>From the given parameters; 3 out of 15 is detective;</em>

So;

p = 3/15

p = 0.2

q = 1 - p

q = 1 - 0.2

q = 0.8

Solving further using binomial;

(p + q)^n = p^n + ^nC_1p^{n-1}q + ^nC_2p^{n-2}q^2 + .....+q^n

Where n = 4

For the probability that exactly 1 out of 4 will be defective, we make use of

Probability =  ^nC_3pq^3

Substitute 4 for n, 0.2 for p and 0.8 for q

Probability =  ^4C_3 * 0.2 * 0.8^3

Probability =  \frac{4!}{3!1!} * 0.2 * 0.8^3

Probability = 4 * 0.2 * 0.8^3

Probability = 0.4096

Solving (c): Probability that at least one is defective;

In probability, opposite probability sums to 1;

Hence;

<em>Probability that at least one is defective + Probability that at none is defective = 1</em>

Probability that none is defective is calculated as thus;

Probability =  q^n

Substitute 4 for n and 0.8 for q

Probability =  0.8^4

Probability = 0.4096

Substitute 0.4096 for Probability that at none is defective

Probability that at least one is defective + 0.4096= 1

Collect Like Terms

Probability = 1 - 0.4096

Probability = 0.5904

8 0
2 years ago
Small-business owner Marcos set up his Google Ads campaign by thinking of “obvious” keywords off of the top of his head. What's
LiRa [457]

Answer:See the suggestions on the Opportunities tab

Explanation: The improvement in the Google ad can be made by the taking a look at the Opportunities tab which will display the adequate opportunities.

The tab displays these opportunities on the basis of the campaign settings, account's history, performance, style, trends etc and thus will create the appropriate opportunities accordingly.Thus Marcos will have to see the suggestion displayed on Opportunities tab

5 0
3 years ago
Which of the following are reasons why it is important to properly recycle electronic equipment? Select all that apply.
faltersainse [42]
I think it is C. Sorry if I am wrong
4 0
3 years ago
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A usability study compares the number of page visits on a web site. Half of the participants saw Version A of the home page. The
USPshnik [31]

Answer:

d. A web analytic

Explanation:

Web analytic measure activity and behavior of a user on a website, for example: how many users visit, how long they stay, how many pages they visit, which pages they visit, and whether they arrive by following a link or not.

Ordinal data is a categorical, statistical data type where the variables have natural, ordered categories and the distances between the categories is not known.

Dependent variable rely on another variable to get a value

Independent variable are variable which can be gotten on their own without relying on another variable.

7 0
3 years ago
You can sort data in a table or_____?<br><br><br> A. Report<br> B. Form<br> C. Field<br> D. Record
Mazyrski [523]

Answer:I believe its form

Explanation:

7 0
3 years ago
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