Question

W 8.1.15 = 71 and o = 27. Suppose a simple random sample of size n-81 is obtained from a population with (a) Describe the sampling distribution of x. (b) What is P (x > 75.2)? (c) What is P (xs 63.5) ? (d) What is P (67.55 < x < 77.15) ? Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). (a) Choose the correct description of the shape of the sampling distribution of x. O A. The distribution is skewed right. B. The distribution is approximately normal OC. The distribution is skewed left. D. The distribution is uniform. E The shape of the distribution is unknown. Find the mean and standard deviation of the sampling distribution of x. Hi = 71 X - 3 (b)P (x > 75.2) = 0.0808 (Round to four decimal places as needed.) (c) P ($63.5) - 0.0062 (Round to four decimal places as needed.) (d) P (67.55<x< 77.15) - 0.8547 (Round to four decimal places as needed.) Question is complete. Tap on the red indicators to see incorrect answers. All parts showing

I need help. PLEASE DONT USE THE STANDARD NORMAL DISTRIBUTION TABLE. use normalcdf as part of your answer.

Thank you

Answer 1

On both the TI 84 and TI 83, NormCDF is in the same place:

Press the 2nd key.
Press VARS .
Scroll to option 2—or just press “2”— for “normalcdf.”

b) normalcdf(75.2,99999,71,3)

TEXAS INSTRUMENTS TI-83 Plus 99991df (75.29 9999;a:07567112 STT PLOT FETISET P2 FORMAT 3 CAC ZOOM TRACE TABLE FS GRAPH INS QUIT MODE DEL ALPHA XT.6. STAT TEST ANGLE DRAW C DISTR MATH APPS PRGM VARS CLEAR MATRX DSIN-1 ECOS FTAN GT ** SIN COS TAN EE { k } x PWC 789 x et SL4T LSU LOW LN 456 - RCL X L1 L2 L3 MEMI STO 123 + OFF CATALOG : ANS ENTRY SOEVE ONO . (-) ENTER 000 GUOLOD

c) normalcdf(-99999,63.5,71,3)

TEXAS INSTRUMENTS TI-83 Plus normalcdf (-99999 63.5,71,3. .0062096799 SUNTPLOTF: TLSET 2 RORMATS CALCE WINDOW ZOOM TRACE TARES GRAPH QUIT INS 2nd MODE DEL A-LOCK LINK L IST ALPHA X,1,0, STAT TEST A ANGLE DRAWC DISTR MATH APPS PRGM VARS CLEAR MATRX DSIN-1 ECOSIF TANG TT X SIN COS TAN VEEK) x2 102 NUO PWO LOG 789 x BI SL LSU LEV LN 456 - RCL L1 L2 L3 MEM STO 123 + OFF CATAL A NS ENTRY SEVE ONO . (-) ENTER 0.00.00 30.0.0.0.0 100.00

d)  normalcdf(67.55,77.15,71,3)

TEXAS INSTRUMENTS TI-83 Plus normalcdf (67.55, 77 15, 71, 13:11 .8547458637 STATPLOT FTSET P2 FORMAT P3 CALCE WINDOW ZOOM TRACE TABLES GRAPH QUIT MODE MODE INS DEL 2nd LIST A-LOCK ALPHA LINK XT6, STAT TESTA ANGLE DRAWC DISTR MATH APPS PRGM VARS CLEAR MATRX D SINE COSI F TANGTH X SIN COSTAN 10% NUOPWO LOG 789 x et SL LSLEV LN 456 - RCL X L1 L2 LS MEM STO 1 2 3 + OFF CATALOG A NS ENTRY SOEVE ONO . (-) ENTER