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19 Answered Questions for the topic Z Score

05/12/20

what is the z score?

the number of hits a particular website receives in a day is normally distributed with a mean of 6250 hits and a standard deviation of 480 hits. what is the Z score for a day in which the website... more

02/25/20

Better Relative Position when both Z Scores are negative

Which Z-Score has the better relative position? -2.05 or -3.33

04/11/18

What is P(z<1.33)?

The expression P(z<1.33) represents the area under the standard normal curve below the given value of z.

04/11/18

What is the age of a movie attendee with a z-score of −1.2 ?

The ages of people in a movie theater are normally distributed with a mean of 32 years and a standard deviation of 6.2 years. (round to nearest tenth)

04/11/18

What is the z-score of 105? (round to nearest hundredth

A normal distribution has a mean of 102 and a standard deviation of 2.9.

04/02/18

There is a 88.4% chance that my value of x is 30 or greater. If I assume my data is normally distributed..

There is a 88.4% chance that my value of x is 30 or greater. If I assume my data is normally distributed, can I determine the likelihood that my value of x is 26, 27, 28, 29, 31, 32, 33, 34... more
Z Score

12/05/17

Percentage of data between the mean

for a normally distributed set of data find the area of the normal curve for the region between z scores of 0.74 and 1.62
Z Score

12/05/17

Data less than a z score of 0.83 is

for a normally distributed set of data the percentage of data less than a z score of 0.83 is
Z Score

12/05/17

Z score and area under normal curve

for a normally distributed set of data find the area of the normal curve for the region between z scores of 0.74 and 1.62
Z Score

10/31/17

Find the​ z-scores that separate the middle 31​% of the distribution from the area in the tails of the standard normal distribution.

find the z scores that separate the middle 31% of the distribution 
Z Score

10/31/17

Find the z scores that separate the middle 80% of the distribution from the area in the tails of the standard normal distribution

Find the z score that separates 80% of the distribution 

05/25/17

What would the mean be?

Person A has a z-score of -3 and is on her phone for 7 hours a day. Person B has a z-score of -4 and is on her phone for 3 hours a day. It is a normal distribution. What would be the mean of the... more

help with a problem and is there any way to check my answer so i am not double guessing?

An elevator has a stated maximum capacity of 12 people or 2004 pounds. If 12 people have weights with a mean greater than (2004/12) = 167 pounds, the capacity will be exceeded. Assume that weights... more
Z Score

02/21/16

Using a normal curve table, what percentage of students have a z scores (a) below 1.5 (b) above 1.5 (c) below -1.5 ?

A psychologist has been studying eye fatigue using a particular measure, which she administers to students after they have worked for 1hour writing on a computer. On this measure, she has found... more

11/05/15

Z-score Stats question

I have no idea evn how to start this question  The average Demand for renatl skis on winter Saturdays at a particular area is 150 pairs which has been quites stable over time. There is variation... more

College Statistics problem help

A weight loss center provided a loss for 72% of its participants.  The center’s leader decides to test a new weight loss strategy on a random sample size of 140 and found weight loss in 78% of the... more
Z Score

07/22/15

If the raw score is 62, the mean is 58 with a standard deviation of 8, what is the Z score?

 An individual receives a raw score of 62 on a national standardized test. Given that the mean & standardized deviation of the test were 58 and 8, respectively, what is the individual's Z-score?
Z Score

12/10/14

Using the z table calculate the following percentage for z score of -0.08?

Above the z score   Below the z score   At least as extreme as this z score

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