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3 years ago

Difference between volatile and non volatile memory

2 answers:

6 0

Volatile memory requires electricity or some kind of current to store information, and nonvolatile memory does not.

Effectus [21]3 years ago

6 0

One backs up data until deleted, the other does not.

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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 $n = 15\ and\ r = 4$

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

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

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

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

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

$^{15}C_4 = 1365$

Hence, there are 1365 ways 

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)

From the given parameters; 3 out of 15 is detective;

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;

Probability that at least one is defective + Probability that at none is defective = 1

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

3 years ago

What target audience does your product serve?

Natasha_Volkova [10]

Answer:

A target audience is the demographic of people most likely to be interested in your product or service. For example if you own a plumbing company, the target audience is property owners, both commercial and residential.

7 0

3 years ago

What information can be determined from a device's MAC address?

rewona [7]

Answer:

I believe it is the NIC manufacturer and the serial number of the NIC

Explanation:

5 0

3 years ago

I have tried many times to find a gaming setup for $4k. I have tried many websites but they are not working for my liking. Any o

Vikentia [17]

I would try going to pcpartpicker.com and build your pc from there, and after you’ve done that take your remaining budget to find whatever else you need for your setup

8 0

2 years ago

Pls answer asap do not use internet

kozerog [31]

Answer:

key differences between linux and windows operating system linux is free and open resource whereas windows is a commercial operating system whose source code is inaccessible windows is not customizable as against linux is customizable and a user can modify the code and can change it looks and feels

Explanation:

I hope this helps

5 0

3 years ago