Advertisements
Advertisements
प्रश्न
Choose the most appropriate option:
The mean of 72 items was found to be 63. If two of the items were misrecorded as 27 and 9 instead of 72 and 90 respectively, find the correct mean.
विकल्प
64.25
64.75
63.25
65.75
उत्तर
64.75
Explanation:
Error in sum`=72+90-27-9=126`
The error means `=126/72=1.75`
APPEARS IN
संबंधित प्रश्न
At their wedding, Riz and Rekha received gifts amounting to a total of Rs. 1,00,000 – some of which was in cash and the rest was in the form of other articles. The cash received by them alone amounted to more than Rs. 35,000. All the cash received by them were by way of currency notes of the denominations of Rs. 2000, Rs. 500 and Rs. 200. When all the cash they received was pooled together, there were 10 notes of a certain denomination, 12 notes of a second denomination, and 16 notes of a third denomination. Riz and Rekha decided to spend an amount equal to the total value of the gifts received by them at their wedding (by way of cash and otherwise) in the ratio of 2:3 on buying a guitar and a sitar, respectively.
Which of the options below states the correct number of currency notes of each denomination received by Riz and Rekha?
If the ratio of the second and third term in the expansion of (a + b)2 is equal to the ratio of third and fourth term in the expansion of (a + b )n+3 then the value of n is equal to :
If a2, b2, c2 are in A.P. then `1/"b + c" ,1/"c + a" , 1/"a + b"` will be
The H.M between 1 and `1/16` will be:
If for two numbers G.M. is 4 and A. M. is 5, then H.M. will be:
Value obtained by reciprocating mean of reciprocal of x1, x2, x3, .... Xn observations is called
Middle most observation in an arranged data set is known as
Sum of deviations of a variable from its mean is always
Positive square root of mean of squared deviations of some observations from their arithmetic mean is called
Measures that are used to determine degree or extent of variation in a data set are called
