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Anon25 [30]
3 years ago
10

Johnny is now 30% older than his sister Sarah. If Sarah is now 12 years old, how old is Johnny

Mathematics
1 answer:
Yuki888 [10]3 years ago
7 0

Answer:

15.6 years old

Step-by-step explanation:

12 x 1.3 = 15.6

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fenix001 [56]

Given Information:  

number of trials = n = 1042

Probability of success = p = 0.80

Required Information:  

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Step-by-step explanation:

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σ = √833.6(0.20)

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μ - 2σ = 807.78

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