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To find z-score and required probabilities based on Normal distribution.

Assume that children's weekly allowances are normally distributed in the population, with μ = $5 and σ = $1. What percentage of children gets a weekly allowance between $3.50 and $6.50?

a. 86.64%

b. 43.32%

c. 6.68%

d. 13.36%

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