Plz help I need help

Mathematics

1 answer:

Mrac [35]2 years ago

3 0

Answer:

What do you need help with mate?

Step-by-step explanation:

you don't have a question posted.

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| 3x | = 9 <br> | -3r | = 9 <br> b/5 = 1

Ierofanga [76]

|3x| = 9
|3x| = ±9
|3x| = 9 U |3x| = -9
3x = 9    U    3x = -9
   3    3     3     3
    x = 3    x = -3

|-3r| = 9
|-3r| = ±9
|-3r| = 9 U |-3r| = -9
   3r = 9 U    3r = -9
    3    3      3    3
    r = 3    r = -3

   ¹/₅b = 1
5(¹/₅b) = 5(1)
   b = 5

8 0

3 years ago

Current research indicates that the distribution of the life expectancies of a certain protozoan is normal with a mean of 49 day

zimovet [89]

Answer:

The probability that a simple random sample of 64 protozoa will have a mean life expectancy of 54 or more days is P(M>54)=0.00004.

Step-by-step explanation:

In this case, we have a population lifetime normally distributed with mean 49 and standard deviation 10.2.

We take a sample of size n=64.

Then, we can calculate the z-score for a sample mean M=54, in order to calculate P(M>54):

$z=\dfrac{X-\mu}{\sigma/\sqrt{n}}=\dfrac{54-49}{10.2/\sqrt{64}}=\dfrac{5}{1.275}=3.922\\\\\\P(M>54)=P(z>3.922)=0.00004$