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3 years ago

Tony wants to buy a ticket for $15.75. He has $9.25. How much must he earn to buy the ticket?

Mathematics

1 answer:

lakkis [162]3 years ago

6 0

$15.75-9.25=6.50.. He needs to earn 6.50

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Fill in the blanks below to make a true statement. In a binomial experiment with n trials and probability of success p, if np (1

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Answer:

$\mu_{x}=np$

$\sigma^2_{X}=np(1-p)$

Step-by-step explanation:

∵ When x is a random variable having distribution B(n, p), then for sufficiently large value of n, the following random variable has a standard normal distribution,

$\frac{x-\mu}{\sigma}\sim N(0,1)$

Where,

$\mu=np$

$\sigma^2=np(1-p)$

Here the variable X has a binomial distribution,

Such that, np (1 - p) ≥ 10 ⇒ n is sufficiently large.

Where, n is the total numbers of trials, p is success in each trials,

So, the mean of variable X is,

$\mu_{X} = np$

And, variance of variable X is,

$\sigma^2{X}=np(1-p)$

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yes it is correct

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