گاما رو نصب کن!

{{ number }}
اعلان ها
اعلان جدیدی وجود ندارد!
کاربر جدید

جستجو

پربازدیدها: #{{ tag.title }}

جستجوهای پرتکرار

میتونی لایو بذاری!

The probability that Sue completes a Sudoku puzzle correctly is 0.75.

a) Sue attempts $n$ Sudoku puzzles. Find the least value of $n$ for which the probability that she completes all $n$ puzzles correctly is less than 0.06.

Sue attempts 14 Sudoku puzzles every month. The number that she completes successfully is denoted by $X$.

b) Find the value of $X$ that has the highest probability. You may assume that this value is one of the two values closest to the mean of $X$.

c) Find the probability that in exactly 3 of the next 5 months Sue completes more than 11 Sudoku puzzles correctly.

پاسخ تشریحی :
نمایش پاسخ

a) ${\left( {0.75} \right)^n} \lt 0.06$

$n \gt 9.78$

$n = 10$

b) $E\left( X \right) = 14 \times 0.75$ or $10.5$

Try $P\left( {10} \right) = {}^{14}{C_{10}}{\left( {0.75} \right)^{10}}{\left( {0.25} \right)^4} = 0.220$

$P\left( {11} \right) = {}^{14}{C_{11}}{\left( {0.75} \right)^{11}}{\left( {0.25} \right)^3} = 0.240$

(mode is) $11$

c) $P\left( { > 11} \right)$

$ = {}^{14}{C_{12}}{\left( {0.75} \right)^{12}}{\left( {0.25} \right)^2} + {}^{14}{C_{13}}{\left( {0.75} \right)^{13}}{\left( {0.25} \right)^1}$

$ = 0.281$

$P\left( 3 \right) = {}^5{C_3}{\left( {0.2811} \right)^3}{\left( {0.7189} \right)^2}$

$ = 0.115$

تحلیل ویدئویی تست

تحلیل ویدئویی برای این تست ثبت نشده است!