Sunday
April 20, 2014

Posts by Kuai


Total # Posts: 840

Steve please help!
C

Statistics Emergency please
You're welcome

Statistics Emergency please
a. µ = np = 540(.12) = 64.8 σ = √(.12*.88/540) = 0.014 z = 0.03/0.014 = 2.14 z = -0.03/0.014 = -2.14 P(-2.14 < z < 2.14) =0.9676 b. µ = np = 540(.12) = 64.8 σ = √(.12*.88/540) = 0.014 z = 0.015/0.014 = 1.07 z = -0.015/0.014 = -1.07 P(-1....

Statistics Emergency please
The sample distribution of p-bar σp = √0.12*0.88/540) = 0.014

Managerial Accounting
Sales. $120 variable manufacturing $60 Selling cost (120*10) 12 72 Contribution margin. $48

Math emergency I have 10 minutes to submit it.
u = x^2 Between (0,9) du = 2x du/2 = x [9/2 e^u du ] from 0 t 9 [9/2 e^u ] from 0 t 9 9/2[e^9 -e^0] 9/2[e^9-1]= 36459.3776741

Math emergency I have 10 minutes to submit it.
x √(13x^2 +36)dx u = 13x^2 + 36 between (36, 49) du= 26x du/26 = x 1/26 (u)^1/2 du 1/26 *2/3 (u)^3/2 to 36 to 49 1/39[ 49^3/2 -36^3/2] 1/39( 343-216) = 127/39

Math
a. P(492 < x-bar < 512) z = (492-502)/100/√90 z = -0.95 is 0.1711 z = (512-502)/100/√90 z = 0.95 is 0.8289 P(-0.95< z < 0.95) = 0.6578 b. P(505 < x-bar < 525) z = (505-515)/100/ √90 z = -0.95 z = (525-515)/100/ √90 z = 0.95 P(-0.95<...

Math
a. P(492 < x-bar < 512) z = (492-502)/100/√90 z = -0.95 is 0.1711 z = (512-502)/100/√90 z = 0.95 is 0.8289 b. P(505 < x-bar < 525) z = (505-515)/100/ √90 z = -0.95 z = (525-515)/100/ √90 z = 0.95 P(-0.95< z < 0.95) = 0.6578 P(-0.95<...

managerial accounting
480,000 x 60% = $288,000 variable cost 480,000 - 288,000 = $192,000 fixed costs 192,000 + 84,000 + 0.60x = x 276,000 = 0.40x x = $690,000 sales Check 690,000 Sales - 192,000 Fixed Costs - 414,000(0.60 x 690,000) variable costs = $84,000 profit

College Math
a. F'(x) = 3(x^2 +4x +2/(x+2)^2 b. F'(x) = 5cos(5x + e^2) c. F'(x) = 6x(e^x) + e^x (6) = 6e^x (x +1)

math
(145*130)/65 = 18850/65 =290 No

math
(125-115)/125 (10/125 )*100 8%

statistics
10/ √(50) = 1.4142 b. The population size is N = 50,000 (to 2 decimals). 1.4142 √ [ (N-1)/(N-n)] (1.4142)√ [49,999/ 49,950] ) =1.41 c. The population size is N = 5000 (to 2 decimals). 1.4142 √ ( 4999/4950) ) = 1.42 d. The population size is N = 500 (to...

statistics
The total number = 409 + 299 + 291 = 999 A) 409/999 = 0.4094 or 0.41 B) 299/999 = 0.2993 or 0.30 C) 291/999 = 0.2913 or = 0.29

Math
=1/(2-(-1) ∫((1/2)x^2 - x + 3) dx from x = -1 to 2 =1/3 [ (1x-x^3/3 ] from x = -1 to 2 =1/3[2-8/3)-(1-1/3)] 1/3[-2/3-2/3] =0

calculus help
R(x)=x(1800-6x) R(x)=1800x-6x^2 R'(x)=1800-12x C'(x)=600-1.2x+.012x^2 Marginal revenue = marginal cost 1800-12x=600-1.2x+.012x^2 1200=10.8x+.012x^2 1200=.012x(900+x) 100,000=x(900+x) 100,000=900x+x^2 x^2+900x-100000 =0 (x-100)(x-1000) =0 x = 100 x+1000) = 0 x = 100 At ...

Math
A

Math
31/10 + 72/5 (31+144)/10 = 175/10 = 17 1/2

Math
C(x)=(0.007/2)x^2 + 130x C(x) =0.0035x^2 +130x +9500

statistics
( .5795, .6388)

statistics; emergency please help me
C. P(Z>-1.5) =0.9938 d. P (Z>-2.5) =0.9332

statistics; emergency please help me
c. P(z < -1.5) = 0.0062 d. P(z< -2.5) = 0.0668

statistics; emergency please help me
C. z =(100-120)/sqrt(48)) =-2.89 z= (110-120)/sqrt((48))= -1.44 P =0.0749-0.0019= 0.0730 d. z= (130-120)/sqrt(48)) =1.44 p = 1-.0.9251 =0.0749

math
M = 3s s + 26 = m s + 26 = 3s 26 = 2s s = 13 54-13 = 41 Correct

statistics
c. z = (100-120)/(200sqrt(120*.4) z = (110-120)/200/sqrt(120*.4)) d. z = (130-120)/200/sqrt((120*.4)) Use Z table

statistics
P(z <-1.0) = 0.1587 P(z <-1.5) = 0.0668 P(z <-2.5) = 0.0062 P(-3 < z < 0) = 0.500-0.0013

stats
a. 12C3(.31)^3(.69)^9 = .23235 b. 1-[(12C0)(.31)^0(.69)^12 + 12C2(.31)^2(.69)^10 + 12C3(.31)^3(.69)^9 ] = 0.5381 c. 12C0(.31)^0 (.69)^12+ 12C1(.31)^1(.69)^11 + 12C2(.31)^2(.69)^10 = 0.2295875

math
Correct

statistics
a. mean = np = 200(.6) =120 Standard deviation = sqrt((.6*.4*200))= sqrt(48)

Statistics
z = (32-30)/4sqrt(16)) z = 2. Z table

Statistics
Yes it is

STATS
Two tailed. = 0.0164 Left tailed = 0.0082

Statistics
Typo P(all) = 3C3 (.67)^3(.33)^0 =0. 300763 Answer is 0.301

Statistics
P(all) = 3C3 (.67)^3(.33)^0 = 300763 Answer is 0.301

Statistics
P(all) = 3C3 (.67)^3 (.33)^0 =

math
1/8

Math 2
-489 > -498

math
1. n/2 = 38/2 =19 2) median is the mean of the 19th and 20th number. Mean = 12/2 = 6

stat
a. P(all) = 16C16(.65)^16 (.35)^0 = 0.0010153 b. P(at least 10) = P(=>10) = 1-P(k<=9) 1-Binomcdf(16,.65,9)= 0.6881 c. P(no more than 12) = P(k <= 12) Binomcdf(16, .65, 12) = 0.8661

statistics
a. E= 1.96 * sqrt((.56*.44/100)) = .09729 b. E= 1.96 * sqrt((.56*.44/400)) = .0486

Math
x^2/5 +8x/5 -1

Statistics
0.2 = (230-226.2)/SD 0.2SD = 3.8 SD = 19

Calculus Help Please!!!
f'(x) = 6x^2 -6x -72 f'(0) = 6(x^2 -x-12) 0 = 6(x+ 3) (x-4) x = -3, 4 f(-4) = 2(-4)^3 -3(-4)^2 -72(-4) +7= 139 f(-3) = 2(-3)^3 -3(-3)^2 -72(-3) +7=132 f(4) = 2(4)^3 -3(4)^2 -72(4) + 7= -145 f(5) = 2(5)^3 -3(5)^2 -72(5)+7= -178

math help
1. x^2 +2xy +y^2 -a^2-2ab-B^2 2. 6(x^4-1) = 6(x^2-1)(x^2 +1) = 6(x-1)(x+1)(x^2+1)

Math
v = (1/3)pi(r^2)h h = 2.8m r =d/2 = 6.8/2 = 3.4m v = (1/3)pi(3.4)^2(2.8)

Statistics
X = 100 + 15(.33) = 105.0

Statistics
mean = (4,253+ 5,578 +6,406+ 7,334+ 8,728 + 11,298 +15,182)/ 7

Statistics
IQ = Q3 - Q1 IQR = 72-25 = 47

Statistics
About 8,397

Statistics
(50*100 + 100*27.20+ 20*12.20)/(50+ 100+20) = $7964/170 = $46.85

Statistics
(11.0-2.0, 11.0+ 2.0) (9.0 , 13.0) 9.0 and 13.0 inches

Statistics
Range= highest value -lowest value Range = $145 - $132 = $13

math help ASAP!!
m(2m+3n)(m-5n)

Economics and Statistics
(50*100 + 100*27.20+ 20*12.20)/(50+ 100+20) = $7964/170 = $46.85

Economics and Statistics
(50*100 + 100*27.20+ 20*12.20)/(50+ 100+20) = $7964/170 = $46.85

algebra
x = 05 y= 0.08 x + y = 5000 0.05x + .08y = 331 x + y = 5000 5x + 8y = 33100 Substitution methods 5(5000-y) + 8y = 33100 25000 -5y + 8y =33100 3y = 8100 y = 2700 x = 2300

math
60%

math
0.5

math
0.4

math
No solution

Statistics
a. 25.4 -+ 1.96 * 2.4 /sqrt((90)) b. 25.4 -+ 1.645 * 2.4 /sqrt((90)) c. 25.4 -+ 2.575 * 2.4 /sqrt((90))

statistics
a. SE = 50/sqrt(15000) * sqrt((60000-15000)/60000-1))

statistics
(20 C 10) (.45)^10 * (.55)^10

statistics
z = (98.5-98.6)/.74/sqr(100) z = (98.7- 98.6)/.74/sqr(100)

statistics
Z = (x -26)/2.4 1.55 = (x-26)/2.4 1.55(2.4) = x -26 1.55(2.4) + 26 = x

math
y = 2x; y = 0.50x + 16

statistics
a. Ok b. 10/23 C. 12/77

algebra
2x + 10 >26 x > 8 2x + 10 > -26 x > -8 x > -8 or x > 8

Intermediate Algebra
1(6-4y) + 4y = 5 6-4y + 4y = 5 -4y + 4y = 5-6 0 = -1 No solution

algebra
4x-1=1 4x -1 + 1 = 1+1 4x = 2 x = 1/2

Math
Elimination 4x-7y=23 3y=-6x+33 4x -7y = 23 6x + 3y = 33 12x -21y = 69 42x + 21y = 231 54x = 300 x = 300/54 y = -1/9

algebra
(x-2)(x +6)

math
One inche I squally 2.5 cm 165/2.5 = 66 inches

Statistics
1/5 * 100 = 20

statistics
S^2 = 9 s = 3 Ans a

statistics
20-8 = 12 Ans b

algebra
a) Let x = number of presale tickets y = number of day of show tickets x + y =< 800 6x + 9y >= 5000 b) 6x + 9y >=5000 6(440) + 9y >=5000 y >= 262.2 263 tickets 440 advance purchase tickets added to 263 day of show tickets is 703 tickets, which is below the 800 t...

math
March 31-21 (Date of note)=10 days remaining. Take the 60 days-10 (days remaining in march)=50-30 (days in April)=20 days So, the maturity date of the note is May 20th.

math
27/53

statistics
Margin of error : 0.372 95 % confidence interval. (15.228, 15.972)

cal
4√7 *e^√7x + c

math
a. b= 29 b. b > 29

Algebra 1
5x-2y=4 3x+y=9 5x -2y = 4 6x + 2y= 18 11x = 22 x = 2 y = 3 (2, 3)

Stats
n=13 xbar=46 df= 12 alpha/2= 0.025 Therefore, t= 2.179 Sd = 5.5377 t = 2.179 (42.65, 49.35) Z = 1.96 (42.99,49.01)

Ratio--math
14/J= 42/12 42(J) = 14(12) 42J = 168 J = 4

Math
F(27.5) =0.9 (27.5) = ?

Algebra 2
e^2t = 160 lne^2t = ln(160) 2t = ln(160) t = ln(160)/2

Algebra 2
2^5x = 85 Log2^5x = log85 5xlog2 = log85 Solve for x x = log85/5log2

Math
8x + 5y = -91 3x + y = -21 8x = 5y = -91 -15x -5y = 105 -7x = 14 x = -2 y = -15 (-2, -15)

Algebra 1B
3x^²-12x+4 3(-2)^2 -12(-2)+4 3(4) +24 +4 12+ 24+4 =40

math
1. b 2. C 3. C 4. A

probability & statistics
m = (12-5)/(11-(-9) m =7/20 y = mx + b 5 = -9(7/20) +b 5 = -63/20 + b 163/20 = b y-intercept (0,163/20)

Math help :(
1) 3w -10w = -7w 2) y + 2y + 3z = 3y + 3z 3) 6r + r -5r 7r -5r = 2r 4) 5x + 2(x + 6) 5x + 2x + 12 = 7x + 12 5) -3m+ 3(m +6) -3m+ 3m + 18 = 18

College geometry
x-intercept (15,0)

maths
15/4/(3/4) 15/4*(4/3) = 5

statistics
proportion = 112/250 = .448 z = (.448 - .47) / sqrt(.47*.53/250) = -0.70 p-value = .2420 Since the p-value is greater than .05, do not reject the null hypothesis. The claim is not supported.

statistics
Z = (score -mean) /sd z = (126.2-135)/4 z = -9.8/4 = -2.45 z-table

Math [Geometry]
6/30 = 10/x 300 = 6x x = 50 50/30 =x/10

Math!
1) 5h ¨C 9 = ¨C16 + 6h -9+16 = 6h-5h 7 = h 4x + 4 = 9x ¨C 36 36 +4 = 9x-4x 40 = 5x 8 =x 5) k < 0 6) q ¡Ý ¨C1 7) p < 8 8)g > 90 9)n ¨C 6 ¡Ý 2; n ¡Ý 8

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