The random variable x represents the number of credit cards that adults have along with the corresponding probabilities. Find the mean and standard deviation. X P(x) 0 0.07 1 0.68 2 0.21 3 0.03 0.01 4 O A. mean: 1.30; standard deviation: 0.44 OB. mean: 1.23; standard deviation: 0.44 OC. mean: 1.30; standard deviation: 0.32 O D. mean: 1.23; standard deviation: 0.66

Q: Prove that a non-empty subset U of R" is a subspace of R" if and only if U = Span(S) for some…

A: Question: Prove that a non-empty subset U of ℝn is a subspace of ℝn if and only if U=SpanS for some…

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Q: 49-52 What is wrong with the equation? 3 8 49. f₁²₂x²² dx = X-4 X -3 2 3 50. 0.0 £²₁ / / dx = -²/31…

A: We have to find the mistakes in the given equation.To check this we will evaluate the integral.

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A: Use pythogorous theorem

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Q: Show that any integer of the form 6k + 5 is also of the form 3j + 2, but not conversely.

A: 2. We can write 6k+5 = 6k+3+2=3(2k+1)+2 lets write 2k+1=j hence 6k+5=3j+2