IQ (the intelligence quotient) is Normally distributed with mean 100 and standard deviation 16. (a) What proportion

Question:

IQ (the intelligence quotient) is Normally distributed with mean 100 and standard deviation 16.

(a) What proportion of the population has an IQ above 120?

(b) What proportion of the population has IQ between 90 and 110?

(c) In the past, about 10% of the population went to university. Now the proportion is about 30%. What was the IQ of the ‘marginal’ student in the past? What is it now?

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

Step by Step Answer:

Related Book For book-img-for-question

Statistics For Economics Accounting And Business Studies

ISBN: 978027368308

4th Edition

Authors: Michael Barrow

See More Books

Question Posted: Aug 25, 2020 08:17 AM

See More Questions

As measured with the Wechsler Adult Intelligence Scale, IQ scores are normally distributed with mean 100 and standard deviation 15. (a) What percent of the adult population has an IQ score of 133 or...
The intelligence quotient (IQ) score, as measured by the Stanford-Binet IQ test, is normally distributed in a certain population of children. The mean IQ score is 100 points, and the standard...
A variable of a population is normally distributed with mean and standard deviation . For samples of size n, fill in the blanks. Justify your answers. a. 68.26% of all possible samples have means...
DFI of real sequences with odd harmonics only Let x(n) be an N -point real sequence with N-point DFT X(k) (N even). In addition, x(n) satisfied the following symmetry property: x(n + N/2) = -x(n) n =...
The number of children in a large city was found to increase and then decrease rather drastically. If the number of children over a 6-year period was given by what was the average number of children...
3. You have an urn with 30 red balls and 60 other balls that are either black or yellow. You dont know the ratio of black to yellow, only that the total of black and yellow is 60. There is a prize...
The following mistakes were located in the books of Samrat Restaurant after its books were closed and a suspense A/c was created in order to get the trial balance agreed: (a) Sales day book was...
The stock in Ivory Corporation is owned by Gold Corporation (80%) and Imelda (20%). Gold Corporation purchased its shares in Ivory nine years ago at a cost of $650,000, and Imelda purchased her...
State whether or not the following items forn part of the assessable income of an Australian resident taxpayer under any provisions other than the capital gains tax provisions. Provide reasons for...
Certain Muslim countries like Saudi Arabia do not allow advertisers to show a frontal picture of a woman with her hair. This creates a challenge for companies like Unilever or Procter & Gamble that...
If x ~ N(10, 9) find (a) Pr(x > 12) (b) Pr(x < 7) (c) Pr(8 < x < 15) (d) Pr(x = 10).
Ten adults are selected at random from the population and their IQ measured. (a) What is the probability distribution of the sample average IQ? (b) What is the probability that the average IQ of the...
In 2014, Inventors Corp. spent $392,000 on a research project, hut by the end of 2014 it was impossible to determine whether any benefit would come from it. Inventors prepares financial statements in...
Because her insurance agency is in a lakeside community, Adriana always asks her homeowners clients what boating activities they engage in, and she is sure to add the Watercraft endorsement...
1. Among all assumptions in CVP analysis, which one do you think is the most critical? Explain. 2. How will you change the cost-volume-profit analysis if the assumption (you identify in the previous...
Construct a confidence interval for p-P2 at the given level of confidence. x =26, n =229, x2 = 31, n = 302, 95% confidence The researchers are % confident the difference between the two population...
AP 9-2 (Moving Expenses) In May of the current year, following a dispute with her immediate superior, Ms. Elaine Fox resigned from her job in Halifax and began to look for other employment. She was...
Minimize the number of states in the following DFA: A b b a a a b b b E B a a
Classify each function as a power function, root function, polynomial (state its degree), rational function, algebraic function, trigonometric function, exponential function, or logarithmic function....
Consider a game of poker being played with a standard 52-card deck (four suits, each of which has 13 different denominations of cards). At a certain point in the game, six cards have been exposed. Of...
What is the conditional probability that the woman will be affected given that the man is affected? How does this value compare with the prevalence in Table 3.5? Why should it be the same (or...
What is the probability that at least one member of the couple is affected? Suppose the probability that both members of a married couple, each of whom is 7579 years of age, will have Alzheimers...
What is the expected overall prevalence of Alzheimers disease in the community if the prevalence estimates in Table 3.5 for specific agegender groups hold? Suppose a study of Alzheimers disease is...
4. The risk-free rate of return is 3.78% and the market risk premium is 6.42%. What is the expected rate of return on a stock with a beta of 1.09?
Maddox Resources has credit sales of $ 1 8 0 , 0 0 0 yearly with credit terms of net 3 0 days, which is also the average collection period. Maddox does not offer a discount for early payment, so its...
Selk Steel Co., which began operations on January 4, 2017, had the following subsequent transactions and events in its long-term investments. 2017 Jan. 5 Selk purchased 50,000 shares (25% of total)...

IQ (the intelligence quotient) is Normally distributed with mean 100 and standard deviation 16. (a) What proportion

Question:

Step by Step Answer:

a To find the proportion of the population with an IQ above 120 we need to use the standard normal d...View the full answer

Statistics For Economics Accounting And Business Studies

Students also viewed these Mathematics questions