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creativ13 [48]
3 years ago
8

Two addends

Mathematics
1 answer:
nataly862011 [7]3 years ago
8 0

Answer:

28

Step-by-step explanation:

18+6+4=28

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An ornithologist has 4 bird feeders at separate locations. She wonders if birds are equally likely to visit each of the feeders.
Marianna [84]

Answer:

the x² test statistic 13.71

Option a) 13.71 is the correct answer.

Step-by-step explanation:

Given the data in the question;

Feeder                     1      2      3       4

Observed visits; o_i  60   90   92    58

data sample = 300

Expected e_i = 300 / 4 = 75

the x² test statistic = ?

X^2_{stat = ∑[ (o_i - e_i)²/e_i]

X^2_{stat = [ (60 - 75)² / 75 ] + [ (90 - 75)² / 75 ] + [ (92 - 75)² / 75 ] + [ (58 - 75)² / 75 ]

X^2_{stat = [ 3 ] + [ 3 ] + [ 3.8533 ] + [ 3.8533 ]

X^2_{stat = 13.7066 ≈ 13.71

Therefore, the x² test statistic 13.71

Option a) 13.71 is the correct answer.

7 0
2 years ago
What is 5x + 12 < 2 ?
Masja [62]

Answer:

x < -2

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Algebra I</u>

Equality Properties

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtraction Property of Equality

Terms/Coefficients

Step-by-step explanation:

<u>Step 1: Define</u>

<em>Identify.</em>

5x + 12 < 2

<u>Step 2: Solve for </u><em><u>x</u></em>

  1. [Subtraction Property of Equality] Subtract 12 on both sides:                       5x < -10
  2. [Division Property of Equality] Divide 5 on both sides:                                 x < -2
5 0
2 years ago
Read 2 more answers
A student reads 3/5 of a book in 30 minutes. if the student is reading at the same speed in 40 minute how much of the book will
Doss [256]
He will read 4/5 of the book in 40 minutes
6 0
3 years ago
Rewrite as a simplified fraction.<br> 2.267....=?
Ugo [173]

Answer:

2267/1000

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
It is estimated that 45% of people in Fast-Food restaurants order a diet drink with their lunch. Find the probability that the f
mixer [17]

Answer:

So, the probability is P=0.041.

Step-by-step explanation:

We know that  45% of people in Fast-Food restaurants order a diet drink with their lunch.

We conclude that the probaility p=0.45 that a person order a diet drink.

We calculate the probability that the fourth person orders a diet drink.  

We get:

P=p^4\\\\P=0.45^4\\\\P=0.041\\

So, the probability is P=0.041.

5 0
3 years ago
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