P ( 0.200 < Z <
1.500 )
= P ( Z < 1.500 ) - P ( Z
< 0.20 ) =
0.9332 -
0.5793 =
0.3539
P ( -1.200 < Z <
0.300 )
= P ( Z < 0.300 ) - P ( Z
< -1.20 ) =
0.6179 - 0.1151 =
0.5028
X | P(X) |
0 | 0.0008 |
1 | 0.0068 |
2 | 0.0278 |
3 | 0.0716 |
4 | 0.1304 |
5 | 0.1789 |
6 | 0.1916 |
7 | 0.1643 |
8 | 0.1144 |
9 | 0.0654 |
10 | 0.0308 |
11 | 0.0120 |
12 | 0.0039 |
13 | 0.0010 |
14 | 0.0002 |
15 | 0.0000 |
16 | 0.0000 |
17 | 0.0000 |
18 | 0.0000 |
19 | 0.0000 |
20 | 0.0000 |
Mean = np = 20*0.3= 6
Variance = np(1-p) = 20*0.3*(1-0.3)=
4.2
Please let me know in case of any doubt.
Thanks in advance!
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