急,设X~N(108,9),)(1)求常数a,使p(Xb}=0.01,

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急,设X~N(108,9),)(1)求常数a,使p(Xb}=0.01,
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急,设X~N(108,9),)(1)求常数a,使p(Xb}=0.01,
急,设X~N(108,9),)(1)求常数a,使p(Xb}=0.01,

急,设X~N(108,9),)(1)求常数a,使p(Xb}=0.01,
1)p(Xb}=P{X>2b}+P{X