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Vanyuwa [196]
2 years ago
6

HELP HELP HELP HELP HELP

Mathematics
2 answers:
adoni [48]2 years ago
6 0

Answer:

2/3 times 198 equals 132

132 students

if you are satisfied with my answer, please mark brainliest :D

Step-by-step explanation:

Crazy boy [7]2 years ago
4 0

Answer:

132 students

Step-by-step explanation:

2/3×198

2×66

132 students

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(-5/2 , 2)

Step-by-step explanation:

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The annual rainfall (in inches) in a certain region is normally distributed with = 40 and = 4. What is the probability that star
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0.93970

Step-by-step explanation:

Solution:-

- Denote a random variable "X" The annual rainfall (in inches) in a certain region . The random variable follows a normal distribution with parameters mean ( μ ) and standard deviation ( σ ) as follows:

                          X ~ Norm ( μ , σ^2 )

                          X ~ Norm ( 40 , 4^2 ).

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                          P ( X > 50 )

- We will standardize our test value and compute the Z-score:

                          P ( Z > ( x - μ )  / σ )

Where, x : The test value

                          P (  Z > ( 50 - 40 )  / 4 )

                          P (  Z > 2.5 )

- Then use the Z-standardize tables for the following probability:

                          P ( Z < 2.5 ) = 0.0062

Therefore,          P ( X > 50 ) = 0.0062

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                           q = 0.0062 ,

- The probability that it rains in a certain region rains below 50 inches annually. is defined by:

                           1 - q = 0.9938

                           n = 10 years   ..... Sample of n years taken

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                          Y ~ Bin ( 0.9938 , 0.0062 )

- The probability that it takes t = 10 years for it to rain:

                         =  10C10* ( 0.9938 )^10 * ( 0.0062 )^0

                         = ( 0.9938 )^10

                         = 0.93970

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