The amounts of time students study for an exam follows a normal model with a mean of 6 hours and a standard deviation of 1.5 hours. what is the probability a student studies between 3.5 and 5.5 hours?
The amounts of time students study for an exam follows a normal model with a
what is the
Obtain the standard z-score for the random variable X equals 3.5.
The standard z-score for the random variable X equals 3.5 is obtained below as follows:
Let X denotes the amounts of time students study for an exam which follows normal distribution with mean of 6 hours and standard deviation of 1.5 hours That is, .
The required standard z-score is,
The standard z-score for the random variable X equals 3.5 is –1.67.
Obtain the standard z-score for the random variable X equals 5.5
The standard z-score for the random variable X equals 5.5 is obtained below as follows:
The required standard z-score is,
The standard z-score for the random variable X equals 5.5 is –0.33.
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