1
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
Consider the data on x taking the values
0, 2, 4, 8,....., 2n with frequencies
nC0 , nC1 , nC2 ,...., nCn respectively. If the
mean of this data is $${{728} \over {{2^n}}}$$, then n is equal to _________ .
2
JEE Main 2020 (Online) 4th September Evening Slot
Numerical
+4
-0
If the variance of the following frequency distribution :

Class         : 10–20 20–30 30–40

Frequency :    2          x          2

is 50, then x is equal to____
3
JEE Main 2020 (Online) 2nd September Evening Slot
Numerical
+4
-0
If the variance of the terms in an increasing A.P.,
b1 , b2 , b3 ,....,b11 is 90, then the common difference of this A.P. is_______.
4
JEE Main 2020 (Online) 7th January Evening Slot
Numerical
+4
-0
If the mean and variance of eight numbers 3, 7, 9, 12, 13, 20, x and y be 10 and 25 respectively, then x.y is equal to _______.
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