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3 years ago

Can anybody help me on this thanks

Mathematics

1 answer:

Kamila [148]3 years ago

5 0

Answer:

a) t=98

b) b=32

Step-by-step explanation:

a) 4t/7 -20=36r

r=1

4t/7-20=36

$\frac{4t-140}{7}$ =36

4t-140=252

4y=392

t=98

b) 2k/5=b/2-12

k=10

20/5=b/2-12

4= $\frac{b-24}{2}$

8=b-24

b=32

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Step-by-step explanation:

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Binomial probability distribution

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$P(X = 1) = C_{14,1}.(0.5)^{1}.(0.5)^{13} = 0.000854$

$P(X = 2) = C_{14,2}.(0.5)^{2}.(0.5)^{12} = 0.0056$

$P(X = 3) = C_{14,3}.(0.5)^{3}.(0.5)^{11} = 0.0222$

$P(X = 4) = C_{14,4}.(0.5)^{4}.(0.5)^{10} = 0.0611$

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$P(X > 4) = 1 - P(X \leq 4) = 1 - 0.0898 = 0.9102$

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