i-Ready Diagnostic Test Diagnostic Measurement, Data, and Geometry 3

Question 1

A circle has a diameter of 10 cm. What is its circumference? (Use π ≈ 3.14)

Accepted Answer

31.4 cm

Answer

Circumference = π × diameter = 3.14 × 10 = 31.4 cm.

Question 2

The stem-and-leaf plot shows stems 1, 2, 3 with leaves 2 4 | 1 3 5 | 0 2. What is the median?

Accepted Answer

21

Answer

The data set is 12, 14, 21, 23, 25, 30, 32; the median (middle value) is 21.

Question 3

A trapezoid has parallel sides of 8 m and 12 m and a height of 5 m. What is its area?

Accepted Answer

50 m²

Answer

Area of trapezoid = ½ × (b₁ + b₂) × h = ½ × (8 + 12) × 5 = 50 m².

Question 4

Which transformation moves every point of a figure the same distance in the same direction?

Accepted Answer

Translation

Answer

A translation slides a figure without turning or flipping it.

Question 5

A data set has a mean of 15 and 6 values. If five values sum to 83, what is the sixth value?

Accepted Answer

7

Answer

Total sum = 15 × 6 = 90; sixth value = 90 − 83 = 7.

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