Visual sequential memory and poor spellers. Holmes, Malone, and Redenbach (2008) found that good readers and good spellers correctly read 93.8±2.9 (M±SD) words from a spelling list. On the other hand, average readers and poor spellers correctly read 84.8±3.0 (M±SD) words from the same spelling list. Assuming these data are normally distributed, what percentage of participants correctly read at least 90 words in the good readers and good spellers group?

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Visual sequential memory and poor spellers.

Holmes, Malone, and Redenbach (2008) found that good readers and good spellers correctly read 93.8±2.9 (M±SD) words from a spelling list. On the other hand, average readers and poor spellers correctly read 84.8±3.0 (M±SD) words from the same spelling list. Assuming these data are normally distributed, what percentage of participants correctly read at least 90 words in the good readers and good spellers group?

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Step 1

Given that,

The random variable X is good readers and good spellers correctly read words from a spelling list.

It is normally distributed.

X~N(μ=93.8,σ=2.9)

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