The mean incubation time of fertilized eggs is 21 days. Suppose the incubation times are approximately normally distributed with a standard deviation of 1 day. (a) Determine the 20th percentile for incubation times. (b) Determine the incubation times that make up the middle 39% of fertilized eggs.
Added by Nicole H.
Step 1
We can use a z-table or calculator to find the z-score corresponding to a cumulative probability of 0.20. The z-score is approximately -0.84. Now, we can use the z-score formula to find the incubation time for the 20th percentile: $X = \mu + Z\sigma$ where X is Show more…
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The mean incubation time of fertilized eggs is 22 days. Suppose the incubation times are approximately normally distributed with a standard deviation of 1 day. (a) Determine the 13th percentile for incubation times. (b) Determine the incubation times that make up the middle 39% of fertilized eggs.
The mean incubation time of fertilized eggs is 21 days. Suppose the incubation times are approximately normally distributed with a standard deviation of 1 day. (a) Determine the 13th percentile for incubation times. (b) Determine the incubation times that make up the middle 39% of fertilized eggs.
Anna D.
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