If the random variable X has x as its nth percentile, then Prob(X<=x) = n/100.
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just multiply the 9.00 percentile to 9.5 so, 9.00*9.5 =85.5 % simple
You cannot. The 75th percentile is the value of a variable such that 75% of the observations are below that value and 25% are higher. The 75th percentile in the heights of adult women will be a measure of height whereas the 75th percentile in the income distribution in a country will be the level of income [in some currency unit] such that 75% of incomes in the country are lower. These examples illustrate that the 75th percentile can be a measurement in any unit and converting to a percentage makes no sense.
You need to look up z-score tables.
To convert your 1979 ACT score to percentile scores, you can reference historical data from the ACT organization, which provides percentile ranks for various scores. You may need to find a specific ACT score percentile table from that year, as percentiles can change annually based on the performance of test-takers. Alternatively, tools or resources that aggregate historical ACT data can help you identify the corresponding percentile for your score. If you cannot find specific data from 1979, you might consider using more recent percentile data as a general guide, keeping in mind that it may not be perfectly accurate for that year.
It is not possible to convert a raw score into a percentile without knowing the distribution of scores and key parameters of the distribution. Since none of this information is provided, it is not possible to give a sensible answer.