. Calculate z-scores for IQ 117 and 129: z1 1.133 z2 1.933

Find probabilities: P(Z < 1.133) 0.8708 P(Z < 1.933) 0.9733

Subtract probabilities: P(1.133 < Z < 1.933) 0.1025

b. 10.25% of the population has IQ scores between 117 and 129.

c. draw a graph visualize a bell curve with the shaded area between IQ 117 and 129, representing 10.25% of the population. Use graphing tools to create the diagram.