Answer:
Explanation:
1) Find the z-scores:
a) z-score for 22.6 inches length
b) z-score for 17.4 inches length
2) Probability
Then, you have to find the probability that the length of an infant is between - 1.00 and 1.00 standards deviations (σ) from the mean (μ).
That is a well known value of 68%, which is part of the 68-95-99.7 empirical rule.
The most exact result is obtained from tables and is 68.26%:
The question wanted you to round the answer to the nearest whole number so the correct answer for acellus is 68%