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Tanya [424]
3 years ago
7

GUYS HELP ME I HAVE TWO QUESTIONS THIS IS THE FIRST QUESTION: A school cafeteria sold 1,280 slices of pizza the first week, 640

the second week, and 320 the third week. If this pattern continues in what week will the cafeteria sell 40 slices? Explain your answer.
2.Dawn spent 26.50, including sales tax on 4 books and 3 folders.The books cost $5.33 each and the total sales tax was $1.73. FI'll in the chart below

Cost of each book

Cost of each folder

Cost of sales tax
Mathematics
2 answers:
Natalka [10]3 years ago
8 0
1. dividing by 2 each time. and it is on the 6th week

Paha777 [63]3 years ago
5 0
2.
Each book is $5.33
Each folder is $1.15
Cost of sales tax is $1.73
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Summation(x - mean)² = (158.2 - 163.22)^2 + (162.8 - 163.22)^2 + (161.5 - 163.22)^2 + (161.2 - 163.22)^2+ (166.5 - 163.22)^2 + (160.1 - 163.22)^2 + (158.4 - 163.22)^2 + (175.6 - 163.22)^2 + (159.9 - 163.22)^2 + (168.8 - 163.22)^2 + (161.9 - 163.22)^2 + (163.7 - 163.22)^2 = 273.5368

Variance, s² = 273.5368/12 = 22.79

This is a test for a single variance. We would set up the test hypothesis.

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The formula for determining the test statistic,x² is

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df = 12 - 1 = 11

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alpha = 1 - 0.9 = 0.1

The critical value from the chi-square distribution table is 17.28. Since 17.28 > 10.0276, we would reject the null hypothesis. Therefore, the filling machine does not need repair because the variance of the process is not more than 25 oz.

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