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AysviL [449]
3 years ago
11

If Tommy ate 5 cupcakes and gave 5 way out of 20 how many are left? 5+5=10-20=10

Mathematics
1 answer:
lana [24]3 years ago
3 0

Answer:

10

Step-by-step explanation:

5+5= 10 (10 cupcakes taken away)

Original amount: 20 cupcakes

20-10=10

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Robert has 17 lb of grain he would like to put into sacks. Each sack will hold three pounds. How many sacks will he need?
satela [25.4K]

Answer:

6

Step-by-step explanation:

17/3=5.67

since you can't have 0.67 sack. you just round it up to 6

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3 years ago
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The pH of a solution is measured eight times by one operator using the same instrument. She obtains the following data: 7.15, 7.
Nikolay [14]

Answer:

(a)7.185

(b)0.000371

(c) 0.019

(d)Sample variance and Sample standard deviation

Step-by-step explanation:

We are given the following sample data.

7.15, 7.20, 7.18, 7.19, 7.21, 7.20, 7.17, 7.18.

(a) Calculate the sample mean. Round your answer to 3 decimal places.

The formula for sample mean =

Sum of terms/Number of terms

= 7.15 + 7.20+ 7.18+7.19+7.21+7.20+7.17+ 7.18/8

= 57.48/8

= 7.185

(b) Calculate the sample variance. Round your answer to 6 decimal places.

The formula for sample Variance =

(x - mean)²/n - 1

n = 8

Sample variance = (7.15 - 7.185)² + (7.20-

7.185)²+ (7.18 -7.185)² + (7.19 -7.185)² + (7.21 - 7.185)² + (7.20 - 7.185)² + (7.17 - 7.185)² + (7.18 - 7.185)² /8 - 1

= 0.001225 + 0.000225+ 0.000025+ 0.000025 + 0.000625 + 0.000225 + 0.000225 + 0.000025/7

= 0.0026/7

= 0.000371428571

Approximately to 6 decimal places = 0.000371

(c) Calculate the sample standard deviation. Round your answer to 3 decimal places.

The formula for Sample Standard Deviation = √Sample variance

= √0.000371428571

= 0.01927248223

To 3 decimal places = 0.019

(d) Which of the following are potential major sources of variability in the experiment

Sample variance

Sample standard deviation

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Reflection on point H
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Usimov [2.4K]
Answer is 4
in the 45 45 90 triangle rule, the longest length is x sq root 2
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a

Step-by-step explanation:

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