In a study of reaction times to a specific stimulus, a psychologist recorded these data (in seconds).
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Class limits Frequency
2.1–2.7 .......12
2.8–3.4 .......13
3.5–4.1 .........7
4.2–4.8 .........5
4.9–5.5 .........2
5.6–6.2 .........1
Find the variance and standard deviation.
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X m f f X m f X 2 m 24 12 288 6912 31 ...View the full answer
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