1.Time spent per day on social media is normally distributed with a mean of 100 minutes anda standard deviation of 35 minutes.a) Would it be "unusual" for one randomly selected person to use social media more than 120minutes per day? Use Tables. Explain your answer based on probability.b) What proportion of the population uses social media between 90 and 120 minutes per day?Use Technology. Show keystrokes and round to 4 decimal places.c) If 50 people who use social media are randomly selected, what is the probability the samplemean time spent per day on social media is more than 120 minutes? Use Tables.

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Asked Apr 10, 2019
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I need to also know and show the steps on how to use the calculator in order to solve it, along with doing a bell curve or another type of curve if needed, and if it's area to the left. 

1.
Time spent per day on social media is normally distributed with a mean of 100 minutes and
a standard deviation of 35 minutes.
a) Would it be "unusual" for one randomly selected person to use social media more than 120
minutes per day? Use Tables. Explain your answer based on probability.
b) What proportion of the population uses social media between 90 and 120 minutes per day?
Use Technology. Show keystrokes and round to 4 decimal places.
c) If 50 people who use social media are randomly selected, what is the probability the sample
mean time spent per day on social media is more than 120 minutes? Use Tables.
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1. Time spent per day on social media is normally distributed with a mean of 100 minutes and a standard deviation of 35 minutes. a) Would it be "unusual" for one randomly selected person to use social media more than 120 minutes per day? Use Tables. Explain your answer based on probability. b) What proportion of the population uses social media between 90 and 120 minutes per day? Use Technology. Show keystrokes and round to 4 decimal places. c) If 50 people who use social media are randomly selected, what is the probability the sample mean time spent per day on social media is more than 120 minutes? Use Tables.

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Step 1

Let X be the random variable that represents time spent per day on social media.

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Step 2

a) Any event is said to be unusual if the probability of that event is less than 0.05. It is required to find the probability that, X is greater than 120 minutes.

It can be found using the z-scores as follows:

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Step 3

Using Excel, the probability, P(X>120) can be calculated by using the NORM.DIST function. The function gives the left tailed...

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