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The percentage of such groups (of 400) would 150 or fewer improve is 16.60.
The percentage is a relative value indicating the hundredth component of any quantity. One percent (symbolized 1%) is the 100th element; as a result, 100 percent represents the entirety and 2 hundred percent specifies twice the given amount. percentage.
As finding 10% of a variety of means to divide through 10, it is not unusual to assume that to locate 20% of a variety you must divide through 20 and so on. Take into account, to discover 10% of the number of manner dividing through 10 because 10 is going into one hundred ten times. consequently, to discover 20% of various, divide via five due to the fact 20 is going into 100 five times.
In arithmetic, a percentage is a number or ratio expressed as a fraction of one hundred. it's far frequently denoted by the usage of the percentage signal, "%", although the abbreviations "pct.", "pct" and on occasion "computer" also are used. A percent is a dimensionless wide variety; it has no unit of size.
In what percentage of such groups (of 400) would
150
fewer improve?
i. e. PC X ≤ 150)
By using
-continuity correction we have to find.
PCX 150.5)= P "X-M1.6.150.5-160°
9.8
= p[ 2 < -0.97
By using the standard Normal table we get,
0.1660
P(X ≤150)
= 0. 1660 = 16.60 (
16.60 percent of such groups (of 400) would 150
fever improve.
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