I tried calculating the problem but couldn't seem to find an answer. I checked on my graphics calculator and on the computer and they provide a "No Solution" answer. The steps shown above lead to a dead end in the calculation.

8 0

2 years ago

How do I go back to my account from Saturday?

Strike441 [17]

Answer:

Save the password and username of brainly, and the next time it happens you just have to login from the information (password and username) you saved. You won't lose your account then.

Hope this helps you!

Step-by-step explanation:

4 0

2 years ago

For a group of 70 people, assuming that each person is equally likely to have a birthday on each of 365 days in the year, comput

ch4aika [34]

Answer:

0.0157

Step-by-step explanation:

From the information given:

The sample size = 70

The expected no. of days of year that are birthday of exactly 4 people is: $P = \bigg [ \dfrac{1}{365} \bigg]^4$

The expected number of days with 4 birthdays = $\sum \limits ^{365}_{i=1} E(x_i)$

$\sum \limits ^{365}_{i=1} E(x_i) = 365 \times \bigg[ \ ^{70}C_{4} \times ( \dfrac{1}{365})^4 ( 1 - \dfrac{1}{365})^{70-4} \bigg]$

$\sum \limits ^{365}_{i=1} E(x_i) = 365 \times \bigg[ \ \dfrac{70!}{4!(70-4)!} \times ( \dfrac{1}{365})^4 ( 1 - \dfrac{1}{365})^{66} \bigg]$

$\sum \limits ^{365}_{i=1} E(x_i) = 365 \times \bigg[ \ 916895 \times 5.6342 \times 10^{-11} \times 0.8343768898 \bigg]$

= 0.0157

Therefore, the required probability = 0.0157

8 0

2 years ago