A toy train can make 10 sounds sound changes after every 4 minute now train is defective
and can make only 2 sounds find probability that same sound is repeated 4 times
consecutively (1 OUT OF__)?

• simply (1/2)^4=1/16
• 11 years agoHelpfull: Yes(15) No(8)
• 1/2^4+1/2^4=1/8
• 11 years agoHelpfull: Yes(6) No(4)
• Probability of defective is 1/2 and probability of undefective is 1/2
  so,
  =(1/2)^4+(1/2)^4
  1/16
• 11 years agoHelpfull: Yes(3) No(11)
• prabha check your calculation it come 1/8
• 11 years agoHelpfull: Yes(2) No(1)
• (1/2*1/2*1/2*1/2)+(1/2*1/2*1/2*1/2)=1/8
• 11 years agoHelpfull: Yes(2) No(0)