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The answer is 0.0021
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Z-score = (raw score - mean) / standard deviation
Z-score = (40,000 - 60,000) / 7,000
Z-score = -20,000 / 7,000
Z-score = -2.8571
Using Z-table, we got:
P(x<40000) = 0.0021
Please click the link below to download.
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From the Z-Table.
Were you able to download the table I sent you?
If you have only positive values, get the value of 2.86 and then, deduct it from 1.
The value of 2.86 is 0.9979
Thus, the value of -2.86 is 1 - 0.9979 = 0.0021
May I see?
This is only half the curve. Add 0.50 to the value you get.