Examples of z-score calculations for statistics students
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1. The weight of cans of fruit is normally distributed with a mean of 1,000 grams and a standard deviation of 50 grams. What percent of the cans weigh 860 grams or less?
a) 0.0100
b) 0.8400
c) 0.0026
d) 0.0001
2). The mean amount spent by a family of four on food per month is $500 with a standard deviation of $75. Assuming that the food costs are normally distributed, what is the probability that a family spends less than $410 per month?
A) 0.2158
B) 0.8750
C) 0.0362
D) 0.1151
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Solution Summary
Complete worked through solutions for two statistics problems. Includes a reference for the required statistical table needed to complete the problems.
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Hi,
1. Need to find the z score for this data.
z = 860 - 1000/50
z = -2.80
Need to look at the area to the left of this value. ...
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