Answer:
(Correct to 4 decimal places)
Step-by-step explanation:
The probability of a continuous normal variable X found in a particular interval [a, b] is the area under the curve bounded by x=a and x=b and is given by:

where




Using a calculator,
Step-by-step explanation:
it's simple:
- 8 tens + 19ones = 9 tens + 9 ones
- 8 tens + 2 ones =7 tens+12 ones
- 7 tens +25 ones = 9 tens + 5 ones
- 70+11=80+1
- 50+13=60+3
- 90+13=100+3