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Whitepunk [10]
3 years ago
10

What’s the sum of - 3 4/5+(- 2 1/2)

Mathematics
1 answer:
saul85 [17]3 years ago
4 0

Answer:

-6 3/10 is your answer

Step-by-step explanation:

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You are conducting a left-tailed test of a claim about a population mean when sigma is unknown with a sample size of 7.
Artyom0805 [142]
<h3>Answer:  -3.71</h3>

========================================================

Explanation:

You'll need to use a T table to answer this question. Your stats textbook should have such a table in the back appendix section.

If your textbook doesn't have the proper table, or you don't have your textbook with you, then I recommend searching online for "t table" and you should have tons of free options to choose from.

In the table you'll look for the degrees of freedom row 6, since the degrees of freedom are equal to n-1. In this case, n = 7.

In this row, locate the column labeled  "alpha = 0.005" and you'll be looking at "one tail". The value in this row and column is roughly 3.707

Since we're doing a left tailed test and we want P(t < C) = 0.005, where C is the critical value we're after. This must mean C < 0. So C = -3.707 approximately. Round this to two decimal places and we end up with -3.71

4 0
3 years ago
miles wants some new games for his phone. each game costs 2.99 how much would it cost if he bought 7 new games
bekas [8.4K]

Answer: $20.93

Step-by-step explanation:

If you take a game that costs $6.99, and then multiplied that by 7, you would get $20.93.

Let me know if this helps!!!

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6 0
3 years ago
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A box in the shape of a rectangular prism has a dimension of 30 meters x 27 meters x 28 meters what is the surface area of the b
erastovalidia [21]
Your answer would be <span> 4812 m².</span>
5 0
3 years ago
15x – 4y = 18<br> As a fraction?
Margaret [11]

Answer:

2(9+2y)/15 Hope this helped!!

Step-by-step explanation:

3 0
3 years ago
Karen is 6 years older than her sister Michelle, and Michelle is 2 years younger than their brother David. If the sum of their a
Vlad [161]

Answer:

18

Step-by-step explanation:

David=x

Michelle=x-2

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sum of ages=62

x+x-2+x+4=62

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x=20

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5 0
3 years ago
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