Please explain your answer as well!

Mathematics

1 answer:

larisa86 [58]4 years ago

7 0

Class A Class B
1 2 3 4 5 6 7 8 4 1 2
 2 3 4 9 5 9
 1 1 4 8 6 2 4 9
 1 7 1 5 7 8 8
 2 5 8 0 3 4 4 6 6 7
 0 9 2 2 5

Mode and Mean for Class A
Mode: 61
Mean: 57.8

Range and Median for Class B
Range: 54
Median: 78

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The Chartered Financial Analyst (CFA) designation is fast becoming a requirement for serious investment professionals. Although

Nastasia [14]

Answer: ($141,775, $158,225)

Step-by-step explanation:

Given : Significance level : $\alpha: 1-0.9=0.1$

Critical value : $z_{\alpha/2}=1.645$

Sample size : n= 49

Sample mean : $\overline{x}=150,000$

Standard deviation : $\sigma=35,000$

The confidence interval for population mean is given by :_

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

$= 150,000\pm (1.645)\dfrac{35000}{\sqrt{49}}\\\\\approx150,000\pm8225\\\\=(150,000-8225,150,000+8225)=(141,775,158,225)$

Hence,he 90% confidence interval for the average salary of a CFA charter-holder = ($141,775, $158,225)

7 0

3 years ago

The roots of x2 − ( ) + 34 are 5 ± 3i.

Angelina_Jolie [31]

Use quadratic formula
if you had ax^2+bx+c=0, then
x= $\frac{-b+/- \sqrt{b^{2}-4ac} }{2a}$
a=1
b=?
c=34
subsitute
$\frac{-b+/- \sqrt{b^{2}-4(1)(34)} }{2(1)}$ =5+/-3i
$\frac{-b+/- \sqrt{b^{2}-136} }{2}$ =5+/-3i
make 5+/-3 into fraction over 2,(10+/-6i)/2
$\frac{-b+/- \sqrt{b^{2}-136} }{2}$ =(10+/-6i)/2
multiply both sides by 2
$-b+/- \sqrt{b^{2}-136}$ =10+/-6i
we conclude that -b=10
b=-10

ok so equaton is
x^2-10x+34

5 0

4 years ago

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Lance baked a pie. Justin ate of the pie, and Joey ate of the pie. How much of the pie is left?

nlexa [21]

How many slices did each person have?

3 0

3 years ago

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Original price $65.00; Markdown: 12%

MAVERICK [17]

65 x .12 = 7.865 - 7.8 = 57.2