Question

The mean of the following Observation is 50
Pls sove it's fast Question no.45 .
I will mark on brainlist answer .

Answer 1

[ (17)(10) + (5a+3)(30) + (32)(50) + (7a-11)(70) + (19)(90) ]
__________________________ = 50

[ 17 + (5a+3) + 32 + (7a-11) + 19 ]

170 + 150a + 90 + 1600 + 490a - 770 + 1710 = 3000 + 600a

40a = 200
a = 5

Frequencies,
30 => 5(5) + 3 = 25 + 3 = 28
70 => 7(5) - 11 = 35 - 11 = 24

Hope this helps... plsss make it the brainliest

Answer 2

here is the answer
I copied this from the upper answer.
so mark it as brainliest