Shady01
Member
- Joined
- Feb 27, 2006
- Messages
- 160
- Gender
- Male
- HSC
- 2006
Cant do em, dont ask
(i)Explain why the probability of getting a sum of 5 when one pair of fair dice is tossed is 1/9
(ii) Find the probability of getting a sum of 5 at least twice when a pair of dice is tossed 7 times.
A=20 deg.
After 6 mins the temp of substance is 80 deg, and after a further 2 mins it is 50 deg. If T(t) is the temp of the substance after t minutes, then newtons law of kooling stats that T satisfies the eqn
Dt/dt= k(T-A)
org eqn T=A+Be^kt
show that k=-(ln2)/2 and find B
(i)Explain why the probability of getting a sum of 5 when one pair of fair dice is tossed is 1/9
(ii) Find the probability of getting a sum of 5 at least twice when a pair of dice is tossed 7 times.
A=20 deg.
After 6 mins the temp of substance is 80 deg, and after a further 2 mins it is 50 deg. If T(t) is the temp of the substance after t minutes, then newtons law of kooling stats that T satisfies the eqn
Dt/dt= k(T-A)
org eqn T=A+Be^kt
show that k=-(ln2)/2 and find B