Scores on an exam were normally distributed. Ten percent of the scores were below 64 and (80

Question:

Scores on an exam were normally distributed. Ten percent of the scores were below 64 and $80 \%$ were below 81 . Find the mean and standard deviation of the scores.

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For answer-question

Statistics For Engineers And Scientists

ISBN: 9780073107677

6th Edition

Authors: William Navidi

See More Books

Question Posted: Jan 28, 2024 01:01 AM

See More Questions

A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 73 and a standard deviation of 8. a. What is the probability that a student scored below...
A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 73 and a standard deviation of 8. a. What is the probability that a student scored below...
Scores on a certain accounting exam were normally distributed with a mean of 75 and a standard deviation of 7. Find the percentile for each individual using Excel's =NORM.S.DIST function. (a) Bob's...
Two stocks, A and B, have beta coefficients of 0.8 and 1.4, respectively. If the expected return on the market is 10 percent and the risk-free rate is 5 percent, what is the risk premium associated...
(a) What is the amplitude of the E field? (b) What is the average power per unit area of the EM wave?
The specification for the length of a shaft is 12 inches 0.001 inch. If the process standard deviation is 0.00033, approximately what percentage of the shafts will be within tolerance?
True or False: For personal investment decision making, rates of return are used more frequently than present worth.
The Sanding Department of Richards Furniture Company has the following production and manufacturing cost data for March 2012, the first month of operation. Production: 9,000 units finished and...
a) Simplify the expression. Express your answer with positive exponents. (4x6) (4) (2x)* (123) 2 b) In 2004, a sum of $1900 is invested at a rate of 3.75% per year (compound interest) for 12 years....
Let $X \sim N\left(\mu, \sigma^{2}ight)$, and let $Z=(X-\mu) / \sigma$. Use Equation (4.25) to show that $Z \sim N(0,1)$.
Speeds of automobiles on a certain stretch of freeway at 11:00 PM are normally distributed with mean $65 \mathrm{mph}$. Twenty percent of the cars are traveling at speeds between 55 and \(65...
Endeavour Films is a production company that produces movies and television shows. It also owns cable television systems that broadcast its movies and television shows. Endeavour transferred to Barco...
You are a financial analyst at an investment management company that focuses on real estate investment. You are required to do a valuation analysis on the following office REIT: Operating Information...
Describe memory system organization and architecture. a. Identify the main types of memory technology. b. Explain the effect of memory latency on running time and how the memory hierarchy reduces the...
Consider the following JavaScript code segment. var num1 = 0; var num2 = 10; for(var i= 0; i < 5; i++){ for (j= 0; j < 3; j++){ num1++; } num2 = num2 - 2; What is the final value of num1?
Q#1: How to compute PV of face value $10,000 when the discount rate is 3% and the maturity is 10 periods of 6 months (5 years)? Interest = face value ($10,000) * coupon rate (2.5%) = $250 1/1/Y1...
Consider the following nonlinear function. f(x) = (x 1) + (x x2) - - Suppose that the initial guess x0 = [3] and the convergence threshold is set to 0.01, please perform the following methods to...
Wolz Company, a small business, has had a defined benefit pension plan for its employees for several years. At the beginning of 2007 the company amended the pension plan; this amendment provides for...
Find the image of x = k = const under w = 1/z. Use formulas similar to those in Example 1. y| y = 0 -21 -2 -1 -1, /1 12 T -1 -1 y= -2 x =0
The article Electrical ImpedanceVariation withWater Saturation in Rock (Q. Su, Q. Feng, and Z. Shang, Geophysics, 2000:6875) reports measurements of permeabilities (in 103m2), porosities (in...
The following data were collected in an experiment to study the relationship between the speed of a cutting tool in m/s (x) and the lifetime of the tool in hours (y). The least-squares quadratic...
The following table presents measurements of mean noise levels in dBA (y), roadway width inm(x 1 ), and mean speed in km/h (x 2 ), for 10 locations in Bangkok, Thailand, as reported in the article...
Consider the series IM8 25 (3)* (a) Write down the first 4 terms of the series, you do not need to evaluate any powers. (b) Write down the first 4 partial sums of the series to two decimal places....
= 5mH, Rf = 40 m, Lf = 3. A series-connected field-winding DC machine has the following parameters: NP Maf 1.5mH, Ra = 20 m, La = 1 mH. The machine is driven by a full-bridge inverter with a bus...
Consider the figure below. C 0.300 F (a) Find the charge stored on each capacitor in the figure shown above (C = 19.2 F, C = 9.26 F, and C3 = 0.300 F) when a 1.57 V battery is connected to the...

Scores on an exam were normally distributed. Ten percent of the scores were below 64 and (80

Question:

Step by Step Answer:

Statistics For Engineers And Scientists

Students also viewed these Business questions