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katen-ka-za [31]
3 years ago
6

What is two fifths plus one fourth plus one tenth

Mathematics
1 answer:
drek231 [11]3 years ago
7 0

Answer:

3/4

Step-by-step explanation:

2/5+1/4+1/10=8/20+5/20+2/20=(8+5+2)/20=15/20=3/4

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A survey of several 9 to 11 year olds recorded the following amounts spent on a trip to the mall: $10.31,$17.22,$26.62,$22.84 Co
dimaraw [331]

Answer:

Step-by-step explanation:

From the information given,

Mean, μ = (10.31 + 17.22 + 26.62 + 22.84)/4 = 19.2475

Standard deviation, σ = √summation(x - mean)/n

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σ = √(151.249475/4)

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The z score for 98% confidence interval is 2.33

We will apply the formula

Confidence interval

= mean ± z ×standard deviation/√n

It becomes

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The upper end of the confidence interval is 19.2475 + 7.16 = 26.41

8 0
4 years ago
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