John Wiley & Sons TI-83 User Manual download pdf (Page 47)

Press the 2

nd

key and then press the VARS key to get

to the DISTR page.

Press the number 2 key.

Type in -1E99, 31.8, 32, .3/

20 ))

Press the ENTER key.

The probability is .0014.

Example: Tuition

According to a recent College report, the average tuition and fees at four year private colleges

and universities in the United States is $18,273 for the academic year 2002–2003. Suppose that

the tuition’s exact distribution is unknown but its mean is $18,273 and its standard deviation is

$2100. If 49 four-year colleges and universities are chosen at random. What is the probability

that the average tuition of the 49 schools is greater than $19,000.

Press the 2

nd

key and then press the VARS key to get

to the DISTR page.

Press the number 2 key.

Type in 19000, 1E99, 18273, 2100/

49 ))

Press the ENTER key.

The probability is .0077.

47

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