Given:
Sample size, n = 40
Sample mean, xb = $6.88
Population std. deviation, σ = $1.92 (known)
Confidence interval = 90%
Assume normal distribution for the population.
The confidence interval is
(xb + 1.645*(σ/√n), xb - 1.645*(σ/√n)
= (6.88 + (1.645*1.92)/√40, 6.88 - (1.645*1.92)/√40)
= (7.38, 6.38)
Answer: The 90% confidence interval is (7.38, 6.38)
Answer:
x=14
Step-by-step explanation:
x-4=⅓(6x-54)
x-4=2x-18
x+14=2x
x=14
Answer:
solve for k, k=-1
Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable
Answer:
12y² + 9y + 7
General Formulas and Concepts:
<u>Algebra I</u>
Step-by-step explanation:
<u>Step 1: Define</u>
<em>Identify</em>
4y² + 5y + 2 + 8y² + 4y + 5
<u>Step 2: Simplify</u>
- Combine like terms (y²): 12y² + 5y + 2 + 4y + 5
- Combine like terms (y): 12y² + 9y + 2 + 5
- Combine like terms: 12y² + 9y + 7
1 - C) 80 beats / min
2 - 1269/3 = 423 mph [ Option D ]
3 - Bag A
4 - 40 * 8 = 320 [ Option C ]
5 - 28 * 15 = 420 [ Option D ]
Hope this helps!