\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Courses
About
Login
Register
C
(
)
⌫
π
e
7
8
9
\(\div\)
\(\sqrt{\,}\)
\(a^{b}\)
4
5
6
\(\times\)
\(\frac{a}{b}\)
ln
1
2
3
-
cos
cos⁻¹
0
.
=
+
sin
sin⁻¹
←
→
!
tan
tan⁻¹
The random variable \(X\) represents the number of siblings a student in a class has. The probability distribution for \(X\) is shown below:
\(x\) (siblings)
0
1
2
3
\(P(X = x)\)
0.3
0.4
0.2
0.1
Calculate the standard deviation \(\sigma(X)\), which shows how much the number of siblings typically varies from the average per student (round to two decimal places).
\(\sigma(X) = \)
7
8
9
+
4
5
6
-
1
2
3
*
C
0
.
÷
Exit