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2 years ago

13. Describe the following relationships amongst organisms:

1 answer:

7 0

I am Guessing "Parasitism" because none of the others are a symbiotic relationship and there is a parasitic relationship

so the answer is "B"

Hope this helped

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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

2 years ago

In Microsoft word you can access the ______ command from "mini toolbar"

Mashcka [7]

Redo command, i think.

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2 years ago

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What specific database stores local user accounts on local computers, and allows users to sign in to and access resources only o

Yuki888 [10]

Answer:

The Security Account Manager

Explanation:

The Security Account Manager (SAM), This is a database file found in Windows Operating Systems.... Windows XP, Windows Vista, Windows 7, 8.1 and 10 that stores users' passwords. It can be used to authenticate local and remote users. It is an important and vital component of how Windows stores passwords locally on the computer.

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3 years ago

Remote authentication has always been a concern because the person is coming from a public network, and many companies require t

g100num [7]

Answer:

Incomplete Question.

I'll answer this question based on general terms

Explanation:

Two Factor Authentication, abbreviated as 2FA.

It is a type of authentication that requires the presentation of two credentials for access to personal data and information.

The credentials needed for a 2FA are

1. Either of the following; PIN, Password or Pattern

2. Your device or gadget which could be an ATM Card, Mobile Phone

3. Biometrics such as fingerprint, voice input

Number one is often referred to as "Something you know"

Number two is referred to as "Something you have"

Number three is referred to as "Something you are"

The 2FA doesn't require the three aforementioned credentials. It only needs just two of the credentials to provide its authentication.

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3 years ago

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To what health hazard are people working in offices most likely to be exposed.

Andrei [34K]

Answer:

Sickness

Explanation:

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3 years ago