moneygod46chapo1712
09.12.2019 •
Mathematics
Aneuroscientist measures the reaction times (in seconds) during an experimental session in a sample of cocaine-addicted (n = 8), morphine-addicted (n = 6), and heroin-addicted rats (n = 12). mean reaction times in each sample were 12, 13, and 17 seconds, respectively. what is the weighted mean for all three samples? hint: the overall mean is not 14.0 seconds. (round your answer to two decimal places.)
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Ответ:
14.54
Step-by-step explanation:
In a weighted average a “weight” is associated to each value.
The weighted mean is computed the following way:
Suppose you want to calculate the weighted mean of the values
a1, a1, …, an
with weights
w1, w2,..., wn
Then
Weighted mean =(w1*a1+w2*a2+... +wn*an)/(w1+w2+...+wn)
In this case we have
a1= 12, w1 = 8
a2 = 13, w2 = 6
a3 = 17, w3 = 12
Weighted mean
(12*8+13*6+17*12)/(8+6+12) = 14.54 rounded to 2 decimal places.
Ответ:
(128/x)*x=(100/48)*x - we multiply both sides of the equation by x
128=2.0833333333333*x - we divide both sides of the equation by (2.0833333333333) to get x
128/2.0833333333333=x
61.44=x
x=61.44 this is the answr