a large number of voltages show a mean of 118.5v and a population standard deviation of 1.20v. determine the percentage of data that falls b

Question

a large number of voltages show a mean of 118.5v and a population standard deviation of 1.20v. determine the percentage of data that falls between 116 and 120 volts.

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Gianna 7 days 2021-11-25T17:34:40+00:00 1 Answer 0 views 0

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    2021-11-25T17:36:11+00:00

    Answer:

    Step-by-step explanation:

    Hello!

    X: voltage, it has a mean of μ= 118.5V and a standard deviation of σ= 1.20V.

    Assuming the variable has a normal distribution, I’ll use the standard normal distribution to calculate the probability that the voltage is between 116 and 120 volts.

    P(116≤X≤120) = P(X≤120) – P(X≤116)

    Using Z= (X – μ)/σ you now standardize the voltage values and get the cumulative probabilities from the tables of Z.

    P(Z≤(120-118.5)/1.20) – P(Z≤(116-118.5)/1.20)

    P(Z≤1.25) – P(Z≤-2.08)= 0.89435 – 0.01876= 0.87559

    87.559% of the data will be between 116 and 120 volts.

    I hope you have a SUPER day!

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