the qurterly returns for a group of 55 mutual funds with a mean of 1.5% and a standard deviation of 5.1% can be moceled by a normal model. based on the model N(0.011, 0.056), what are the cutoff values for the
a) a highest 40% of these funds?
b)lowest 20%?
c)middle 80%?
d) higest 80%?

Respuesta :

For the top 40% of the funds, the cutoff value is 0.025.

A continuous data distribution with a bell-shaped curve is called a normal distribution. The mean and standard deviation of the random variable with a normally distributed value is x.

The amount of standard deviations the data point deviates from the mean is shown by the standardized z-score.

Below is how the highest 40% of these monies were obtained:

Considering,

    P (Z > z) = 0.40

1 - P (Z ≤ z) = 0.40

   P (Z ≤ z) = 0.60

The area to the left, z = 0.25, is determined by the junction of the row and column values.

The value of z that corresponds to the probability of 0.60 in the "Standard normal table" is 0.25.

z = (x - μ) / σ

0.25 = (x - 0.011) / 0.056

0.25 * 0.056 = x - 0.011

x = 0.014 + 0.011

x = 0.025

The probability of the standard normal table, which corresponds to the top 40% of the funds, is 0.6. The cutoff value for the highest 40% of the funds is calculated by multiplying the population mean by the product of the z-value and standard deviation.

To know more about Z-value, refer to this link:

https://brainly.com/question/22068540

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