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pav-90 [236]
2 years ago
15

The Z-score is based on the concept of the normal distribution, the fact that we can expect 95% of the values in the distributio

n to be between 2 standard deviations below the average and 2 standard deviations above the average. Say the average weight of a 4 year old girl is 15 kilograms and the standard deviation is 3 kilograms.
What is true of the following weights:
12 kilograms
a) maybe not healthy
b) definitely not healthy
c) in perfect health
d) We can say nothing based on this
Mathematics
1 answer:
Dennis_Churaev [7]2 years ago
7 0

Answer:

C.) In perfect health.

Step-by-step explanation:

Given an average weight of 15kg and a standard deviation of 3kg for children of 4 years. Since the weight is based on a normal Z - distribution of 95% which is mean ± 2(standard deviations)

Mean weight interval is :

15 - 2(3) ; 15 + 2(3)

(9 ; 21) ; this weight interval could be interpreted to mean the normal or perfect weight value.

Therefore, given that the child weighs 12kg

Since, 12 kg falls within in the interval, we can conclude that the child is in perfect health.

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Alinara [238K]
Just divide 48 by 8 to give 6.
8 0
3 years ago
a dance team has 80 dancers.The ratio of seventh-grade dancers to all dancers is 5:16.Find the number of seventh-grade dancers o
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Answer:

  25

Step-by-step explanation:

Each of the 16 "ratio units" representing all 80 dancers must stand for ...

  (80 dancers)/(16) = 5 dancers

Then 5 "ratio units" representing seventh-grade dancers will stand for ...

  5 × 5 dancers = 25 dancers

___

Another way to figure this is to write the proportion ...

  (seventh-grade dancers)/(all dancers) = 5/16

  seventh-grade dancers = (all dancers)×(5/16) = 80×5/16

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5 0
3 years ago
WILL GIVE A BRAINLIEST!! PLEASE HELP!!
tia_tia [17]
<span>3^5 * 6^-6 / 3^3 * 6^-4
= 3^2 6^-2
= 3^2 / 6^2
= 9/36
=1/4

answer
</span><span>C.
1/4</span>
5 0
2 years ago
What is the answer? I don’t know how to say that much nicer.. i need help though.
Marysya12 [62]
Sorry bro idkhdjdjjdjdjdjfjfjxjj83848 89**%%
5 0
3 years ago
I just completed 12 questions on a test the progress bar shows 20% is complete how many total questions are on the test?
Mademuasel [1]
If 12 is 20%, then 24 is 40%, then 36 is 60%, then 48 is 80%, then 60 is 100%

So there are 60 questions on the test.
7 0
3 years ago
Read 2 more answers
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