1. Mean = = 100
Variance = =
Standard deviation= = 4
From empirical rule we know that 68% of data lies within 1 standard deviations from the mean.
So, = 100-4 = 96
= 100+4 = 104
Then 68% of data fall in a) 96 - 104. (Option a)
2. The data looks like -
So, we can see 34%+13.5% = 47.5% of data lies between the given interval.
Option b is correct.
3. Mean = = 40
Standard deviation= = 8
z score = -1.25
Option d is correct.
1. If X-N (100, 42), then 68% of the data fall in what range? a. 96...
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