The probability that a randomly selected day will have a group trades total within 85,000 of the mean is 0.1328.
What is the probability about?
In the question given, the Mean (u) is said to be = 3421439
Therefore since Standard deviation = 508638.08
Note that:
z = x-u/sd
So:
P(u - 85000 <= x <= u + 85000)
u = 3421439
We insert the formula into the equation and it will be
= P(3421439 - 85000, 3421439 + 85000)
= P(3336439, 3506439)
= (3336439 - 3421439) / 508638.08, 3506439-3421439) / 508638.08)
= prob(-0.1671 and 0.1671 (So check the column under the z table)
So:
= 0.5664 - 0.4336
= 0.1328
Learn more about probability from
https://brainly.com/question/24756209
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