26 There are 2 sets of traffic lights on Li’s journey to work. The probability he stops at the first set of traffic lights is 0.4 . The probability he stops at the second set of traffic lights is 0.7 . First set of traffic lights Second set of traffic lights Stops ................ Stops 0.4 ................ Does not stop Stops ................ ................ Does not stop ................ Does not stop (a) Complete the tree diagram. [2] (b) Work out the probability that Li does not stop at both sets of traffic lights. ................................................. [2] Question 27 is printed on the next page. (cid:300)(cid:207)(cid:266)(cid:174)(cid:288)(cid:180)(cid:237)(cid:200)(cid:245)(cid:207)(cid:298)(cid:197)(cid:266)(cid:221)(cid:251)(cid:181)(cid:258)(cid:215) [Turn over © UCLES 2025 (cid:300)(cid:295)(cid:178)(cid:250)(cid:209)(cid:300)(cid:237)(cid:248)(cid:232)(cid:245)(cid:242)(cid:245)(cid:263)(cid:174)(cid:181)(cid:194)(cid:265)(cid:258) 0580/13/O/N/25 (cid:293)(cid:197)(cid:245)(cid:277)(cid:181)(cid:245)(cid:261)(cid:245)(cid:197)(cid:197)(cid:245)(cid:197)(cid:197)(cid:277)(cid:229)(cid:213)(cid:293)(cid:213) M SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD * 0000800000016 * 16 (cid:44)(cid:1)(cid:1)(cid:1)(cid:1)(cid:9)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:2)(cid:7)(cid:44) NIGRAM DFD