The scores on a psychology exam were normally distributed with a mean of 62 and a...

Question

Question

The scores on a psychology exam were normally distributed with a mean of 62 and a standard deviation of 9. A failing grade on

math Statistics-And-Probability

Answer 1

Answer #1

Solution :

Given that ,

b) P(x < 44 )

= P[(x - $\mu$ ) / $\sigma$ < (44 - 62) / 9 ]

= P(z < -2.0)

Using z table,

= 0.0228

percentage = 2.28%

Approximately 2.3% of the students failed

Answer 2

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