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strojnjashka [21]
3 years ago
12

I need help!!! please XD

Mathematics
1 answer:
BabaBlast [244]3 years ago
5 0

Answer:

with? TwT mental? physical?

Step-by-step explanation:

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A manufacturer of new light bulbs claims the average lifetime of its long-life bulb is more than 4000 hours. To test this claim,
natka813 [3]

Answer: C. 12.5

Step-by-step explanation:

Given : A manufacturer of new light bulbs claims the average lifetime of its long-life bulb is more than 4000 hours.

Population mean :  \mu=4000

Sample size : n= 100

Sample mean : \overline[x}=4500

Standard deviation: s=400

The value of test-statistic is given by :-

z=\dfrac{\overline{x}-\mu}{\dfrac{s}{\sqrt{n}}}\\\\\Rightarrow\ z=\dfrac{4500-4000}{\dfrac{400}{\sqrt{100}}}\\\\\Rightarrow\ z= 12.5

Hence, the value of the test statistic for this problem is 12.5.

5 0
3 years ago
1. Integers are not closed under which operation?
velikii [3]

Answer:

Integers are not closed under the DIVISION operation

Example:

(9 ÷ 2 = 4½)

4 0
3 years ago
Represent the arithmetic series using the recursive formula. 94, 89, 84, 79, … <br>pLeAsE hUrRy
andreev551 [17]

Answer:

The answer is 5

Step-by-step explanation:

Hope it helps <3 c:

6 0
2 years ago
Show work how you know it’s a function or not a function for each problem. PLEASE SOMEONE HELP ME OUT
Fudgin [204]

Answer: Function, not a function, Function, not a function

Step-by-step explanation:

For it to be a function, each value of x has to map onto one value of y.

  1. This is a function.
  2. Not a function since x=-1 has more than one y value.
  3. This is a function
  4. Not a function since x=-6 has more than one y value.
7 0
1 year ago
A plant will become invasive when the number of plants reaches​ 10,000. Model the situation with an exponential growth function.
sweet-ann [11.9K]
20,000 years hope this helped
3 0
3 years ago
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