I need help with this slope problem

Mathematics

1 answer:

sweet [91]2 years ago

8 0

Answer:

what is it? you did not post the picture

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Find the probability of at least 2 girls in 8 births. assume that male and female births are equally likely and that the births

Afina-wow [57]

At least two girls means either 2, 3 ... or 8 girls.
Using the binomial law, we can write the probability in the form:
B(2,0.5)+B(3,05)+...+B(8,0.5)= $0.0039(C_8^2+...+C_8^8)$
Continue simplifying:
$C_8^2+...+C_8^8=2^8-C_8^1=2^8-8=248\\\text{We deduce the probability of the event "at least two girls in birth ":}\\0.0039\times248=0.96\\\text{The above probability (0.96) means that the event is very likely}$

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2 years ago

Which are solutions of x2=-11+4?

Dovator [93]

For this case we have a quadratic equation of the form:

$ax ^ 2 + bx + c = 0\\x ^ 2 + 11x-4 = 0$

Where:

$a = 1\\b = 11\\c = -4$

We find the roots:

$x = \frac {-b \pm \sqrt {b ^ 2-4 (a) (c)}} {2 (a)}\\x = \frac {-11 \pm \sqrt {11 ^ 2-4 (1) (- 4)}} {2 (1)}\\x = \frac {-11 \pm \sqrt {121 + 16}} {2}\\x = \frac {-11 \pm \sqrt {137}} {2}$