Twenty-six biased coins are flipped once. The coins are weighted so that the probability of a head with any coin is 0.3. What is the probability of getting at least 15 heads

The probability of getting at least 15 heads in 26 tosses is 0.0030.

Step-by-step explanation:

Let X = number of heads.

The probability of getting a head is, P (X) = p = 0.30.

The number of coins flipped is, n = 26.

The random variable X follows a Binomial distribution with parameter n = 26 and p = 0.3.

The probability mass function of a Binomial distribution is:

Compute the probability of getting at least 15 heads as follows:

P (X ≥ 15) = 1 - P (X < 15)

Thus, the probability of getting at least 15 heads in 26 tosses is 0.0030.

i need the options

step-by-step explanation:

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

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