TABLE $3\mathrm{.}1\mathrm{.}2$

CONCRETE PROPERTIES AT $28$ DAYS

Table $3\mathrm{.}1\mathrm{.}2$ appears in AS$3600$ as shown above. The mean compressive

strength for concrete with a characteristic compressive strength of $100$ MPa is:

$($a$)$ incorrect because the mean compressive strength value is the characteristic

compressive strength $+1\mathrm{.}64$ standard deviation

$($b$)$ incorrect because the mean compressive strength value is the characteristic

compressive strength $-1\mathrm{.}64$ standard deviation

$($c$)$ correct because the mean compressive strength value is the characteristic

compressive strength $-1\mathrm{.}64$ standard deviation

$($d$)$ correct because it's in the Concrete Structures Code

$($e$)$ None of the other answers is correct