Not sure if this is what you need
The correct answer is 1/3
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Answer:
7/10
Step-by-step explanation:
2/5 multiply the denominator by 2 which will make it 10. Then multiply the numerator by 2 which will make it 4. So it will be 4/10. Then add 4/10 to 3/0 which makes 7/10.
.3997 + 0.5 = 89.97%
Use your z table to get the area under the curve from 50 to 59. 50 is 1.28 std deviations from the mean. Then add the other 50%
