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HACTEHA [7]
3 years ago
6

Samples of size n = 600 are taken from a telephone survey, and the mean age is taken for each sample. What is the distribution o

f the sample means?
A. skewed to the left
B. normal (approximately)
C. not enough information provided
D. skewed to the right
Mathematics
1 answer:
Nonamiya [84]3 years ago
6 0
The answer in B. For complicated statistics reasons the Central Limit Theorem states that, for sample sizes of above 25 (or 30 depending on the text!), the distribution of sample means is approximately normal regardless of the distribution of the parent distribution
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Last summer, Betty earned $4200 by painting houses. She invested
Musya8 [376]

x*(1.035) + (4,200-x)*(1.045) = 4,374.00

1.035x + 4,389.00 -1.045x = 4,374.00

15.00  = .01x

x = 1,500  so x (1,500) invested at 3.5% and  

(4,200 - 1,500) (or 2,700) invested at 4.5%

3 0
3 years ago
Answers are<br> O - 17<br> O - 16<br> O - 15<br> O - (-16)
Rasek [7]
Interior angles on parallel lines cut by a traversal are supplementary (they add up to 180°). These can be identified as "c" angles, due to their shape. Knowing this, we can figure out the value of x:
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5 0
3 years ago
What is the area of this composite shape?
NNADVOKAT [17]
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area of figure = 42 + 9 = 51

answer
51 <span>in²</span>
7 0
3 years ago
Prove sin^2A + cos^2A = 1
Nady [450]

Step-by-step explanation:

{sin}^{2} A +  {cos}^{2} A  = 1 \\ lhs =  {sin}^{2} A +  {cos}^{2} A  \\  =  {sin}^{2} A +  1 - {sin}^{2} A  \\  = 1 \\  = rhs \\  \therefore \:  {sin}^{2} A +  {cos}^{2} A  = 1 \\

8 0
3 years ago
There are 9 lions there are fewer cubs than lions how many fewer cubs are there ?
Aleks04 [339]

Number of cubs are less than 9.

In Algebra, an inequality is a mathematical statement that uses the inequality symbol to illustrate the relationship between two expressions. An inequality symbol has non-equal expressions on both sides. It indicates that the phrase on the left should be bigger or smaller than the expression on the right, or vice versa. Literal inequalities are relationships between two algebraic expressions that are expressed using the inequality symbols.

NO. OF LIONS = 9

Cubs are fewer than 9

To learn more about inequality, refer to brainly.com/question/25275758

#SPJ9

7 0
1 year ago
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