weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of 50$. find the probability that a worker selected at random makes between $350 and $400.

The mean is in the middle and is where you start from. Normal distribution curves go out 3 standard deviations from the mean, and the standard deviation you are given is 50.

Therefore, 1 standard deviation under/below the mean would be 400 - 50 = 350.

Standard deviations have a set percentage/probability from the mean. I'm sure you've heard of the 68-95-99.7 rule? One standard deviation from the mean is 68%, but since you only want one standard deviation under the mean, you can divide by 2 to get 34%.

So there is a 34% chance that a worker selected at random makes between $350-$400.

weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of 50$. find the probability that a worker selected at random makes between $350 and $400.​

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weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of 50$. find the probability that a worker selected at random makes between $350 and $400.