Marks on a public health test follow a normal distribution with a mean of 77 and a standard deviation of 11. what is the approximate 40th percentile of the mark distribution (40% of data is equal or less than what mark)?

58.

Step-by-step explanation:

We have been given that marks on a public health test follow a normal distribution with a mean of 77 and a standard deviation of 11. We are asked to find the approximate 40th percentile of the mark distribution.

We will use z-score formula and normal distribution table to solve our given problem.

, where,

z = Z-score,

x = Sample score,

= Mean,

= Standard deviation.

From normal distribution table, we need to find z-score corresponding to 40th percentile or 0.40.

Let us solve for x.

Therefore, the approximate 40th percentile of the mark distribution would be 58.

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step-by-step explanation:

im pretty sure it would be 5 am, hope that , and give brainliest and guys if this is right then press the button and give 5 stars