The mean of two groups of sizes 200 and 300 are 25 and 10 respectively. Their standard deviation....

Channel:
Subscribers:
261,000
Published on ● Video Link: https://www.youtube.com/watch?v=vZuFcELexOs



Duration: 4:11
1 views
0


The mean of two groups of sizes 200 and 300 are 25 and 10 respectively. Their standard deviation are 3
\( \mathrm{P} \)
and 4 respectively. The variance of combined sample of size 500 is equal to
(1) 64
(2) 65.2
(3) 67.2
(4) 64.2


📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live




Other Videos By PW Solutions


2024-01-22The arithmetic mean of the following data is given by \begin{tabular}{|l|l|l|l|l|l|} \hline Vari....
2024-01-22The mean square deviation of a set \( \mathrm{n} \) observations \( x_{1}, x_{2}, \ldots \ldots ....
2024-01-22Let \( x_{1}, x_{2}, \ldots . x_{n} \) be \( \mathrm{n} \) observation such that \( \sum x_{i}^{....
2024-01-22If the standard deviation of \( x_{1}, x_{2}, \ldots x_{n} \) is 3.5 , then the standard deviati....
2024-01-22Probability that ' \( A \) ' speaks truth is \( 4 / 5 \). A coin is tossed. ' \( A \) ' reports ....
2024-01-22The mean of the following freq. table is 50 and \( \Sigma \mathrm{f}=120 \) \begin{tabular}{|l|l....
2024-01-22The mean deviation about median from the following data \( 340,150,210,240,300,310,320 \), is....
2024-01-2210 is the mean of a set of 7 observations and 5 is the mean of a set of 3 observations. The mean....
2024-01-22Let A \& B are two independent events such that P(A) \( =\frac{1}{3} \) and \( \mathrm{P}(\mathr....
2024-01-22The probability of guessing correctly at least 8 out of 10 answers on a true - false examination....
2024-01-22The mean of two groups of sizes 200 and 300 are 25 and 10 respectively. Their standard deviation....
2024-01-22The variance of first 20 -natural number is....
2024-01-22If the mean of the series \( x_{1}, x_{2}, \ldots \ldots x_{n} \) is \( \bar{x} \), then the mea....
2024-01-22Words are formed using all letters of the word "CANADA". A word is selected from these words ran....
2024-01-22A fair coin is tossed ' \( n \) ' times. If the probability that head occurs 6 times is equal to....
2024-01-22An unbiased coin is tossed. If the result is a head, a pair of unbiased dice is rolled and the s....
2024-01-22A JEE aspirant estimates that she will be successful with an \( 80 \% \) chance, if she studies ....
2024-01-22If \( p \) and \( q \) are chosen randomly from the set \( \{1,2,3 \), ... 10\( \} \) with repla....
2024-01-22A JEE aspirant estimates that she will be successful with an \( 80 \% \) chance, if she studies ....
2024-01-22Let \( E \) and \( F \) be two independent events. The probability that exactly one of them occu....
2024-01-22A bag contains 4 green and 3 red balls and bag B contains 4 red and 3 green balls. One bag is ta....