The quadratic regression corresponding to the number of birds f(x) in a park relative to the number of people x in the same park is given by f(x)=−0.1536x^2+3.3915x+88.738.

Use the quadratic regression to estimate the number of people in the park when there are 80 birds. Round your answer to the nearest whole number.

Exclude leap years from the following calculations. (a) compute the probability that a randomly selected person does not have a birthday on october 4. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability that a randomly selected person does not have a birthday on the 1st day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability that a randomly selected person does not have a birthday on the 30th day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (d) compute the probability that a randomly selected person was not born in january. (type an integer or a decimal rounded to three decimal places as needed.)