Some states now allow online gambling. As a marketing manager for a casino, you nised to determine the percentage of adults in those states who gamble online. How many adults must you survey in order to be 95% corfident that your estimate is in error by no more than one percentage point? Complete parts (a) and (b) below.

a. Assume that nothing is known about the paroanitage of adults who gamble ori neR

(Round up to the nearest integer.)

b. Assume that 18% of all adults gamble online.

naB

(Round up to the nearest integer.)

IQ Scores IQ scores (as measured by the Stanford-Binet intelligence test) are normally distributed with a mean of 100 and a standard deviation of 16. What percentage of the population has an IQ score between 110 and 140? (Round your answer to the nearest percentage point).

IQ Scores IQ scores (as measured by the Stanford-Binet intelligence test) are normally distributed with a mean of 100 and a standard deviation of 16. What percentage of the population has an IQ score between 110 and 140? (Round your answer to the nearest percentage point).

Assume that adults have IQ scores that are normally distributed with a mean of 103.7 and a standard deviation of 19 find the first quartile which is the IQ score separating the bottom 25% from the top 75%. (Hint: Draw a graph.)

The first quartile is ______

 (Type an integer or decimal rounded to one decimal place as needed.)