Given let values = [3, 6, 9, 12], which Swift code correctly calculates the average as a Double with explicit conversion?

hard📝 Application Q8 of 15

Swift - Data Types

Given let values = [3, 6, 9, 12], which Swift code correctly calculates the average as a Double with explicit conversion?

Alet avg = Double(values.reduce(0, +)) / Double(values.count)

Blet avg = values.reduce(0, +) / values.count

Clet avg = values.reduce(0, +) as Double / values.count

Dlet avg = Double(values.reduce(0, +) / values.count)

Step-by-Step Solution

Solution:

Step 1: Sum the integers
Use reduce(0, +) to sum array elements.
Step 2: Convert sum and count to Double
Convert both sum and count to Double for floating-point division.
Step 3: Calculate average
Divide converted sum by converted count.
Final Answer:
let avg = Double(values.reduce(0, +)) / Double(values.count) -> Option A
Quick Check:
Convert both numerator and denominator to Double [OK]

Quick Trick: Convert sum and count to Double before division [OK]

Common Mistakes:

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