Question

the arithmetic mean the numbers 12 and 28​

Answer 1

Answer:

One method is to calculate the arithmetic mean. To do this, add up all the values and divide the sum by the number of values. For example, if there are a set of “n” numbers, add the numbers together for example: a + b + c + d and so on. Then divide the sum by “n”.

Answer 2

Answer:

147.75

Step-by-step explanation:

x= weighted mean as given

w1=1,w2=3, w3=4 w4=? and n1=26,n2=28

x=10,

n3=12,n4=4

x =w1n1+w2n2+w3n3+w4n4/n1+n2+n3+n4

10.7 1(26)+3(28)+4(12)+4(w4) / 26+28+12+4

10.7-158+4w4 / 70

10.7(70) 158+ 4w4

591=4w4

591/4 =w4

w4 =147.75