HSC Commerce (English Medium) 11th Standard - Maharashtra State Board Question Bank Solutions for Mathematics and Statistics

If the correlation coefficient between x and y is 0.8, what is the correlation coefficient between `("x" - 5)/7` and `("y" - 3)/8`?

In the calculation of the correlation coefficient between the height and weight of a group of students of a college, one investigator took the measurements in inches and pounds while the other investigator took the measurements in cm. and kg. Will they get the same value of the correlation coefficient or different values? Justify your answer.

If A and B are subsets of the universal set X and n(X) = 50, n(A) = 35, n(B) = 20, n(A'∩B') = 5, find: n(A ∩ B)

If A and B are subsets of the universal set X and n(X) = 50, n(A) = 35, n(B) = 20, n(A' ∩ B') = 5, find: n(A' ∩ B)

If A and B are subsets of the universal set X and n(X) = 50, n(A) = 35, n(B) = 20, n(A' ∩ B') = 5,  find: n(A ∩ B')

Write the conjugates of the following complex numbers: 3 + i

Write the conjugates of the following complex numbers: 3 – i

Write the conjugates of the following complex numbers: `-sqrt(5) - sqrt(7)  "i"`

Write the conjugates of the following complex number:

`-sqrt(-5)`

Write the conjugates of the following complex numbers: 5i

Write the conjugates of the following complex numbers: `sqrt(5) - "i"`

Write the conjugates of the following complex numbers: `sqrt(2) + sqrt(3)  "i"`

Express the following in the form of a + ib, a, b ∈ R, i = `sqrt(-1)`. State the values  of a and b:

(1 + 2i)(– 2 + i)

Express the following in the form of a + ib, a, b ∈ R, i = `sqrt(-1)`. State the values  of a and b: `("i"(4 + 3"i"))/((1 - "i"))`

Express the following in the form of a + ib, a, b ∈ R, i = `sqrt(-1)`. State the values  of a and b: `((2 + "i"))/((3 - "i")(1 + 2"i"))`

Express the following in the form of a + ib, a, b ∈ R, i = `sqrt(-1)`. State the values of a and b: `(3 + 2"i")/(2 - 5"i") + (3 - 2"i")/(2 + 5"i")`

Express the following in the form of a + ib, a, b ∈ R, i = `sqrt(-1)`. State the values of a and b: `(2 + sqrt(-3))/(4 + sqrt(-3))`

Express the following in the form of a + ib, a, b ∈ R, i = `sqrt(-1)`. State the values of a and b: (2 + 3i)(2 – 3i)

Express the following in the form of a + ib, a, b ∈ R, i = `sqrt(-1)`. State the values of a and b: `(4"i"^8 - 3"i"^9 + 3)/(3"i"^11 - 4"i"^10 - 2)`

Show that `(-1 + sqrt(3)i)^3` is a real number.