Auto LLC collected internal auditing data for four months, January through April. Auto decided to weight the data. January $-19$ weight $0\mathrm{.}10,$ February $-16$ weight $0\mathrm{.}25,$ March $-17$ weight $0\mathrm{.}30$ and April $-18$ weight $0\mathrm{.}35.$ Using weighted average the forecast for May is

Select one:

a$.17\mathrm{.}2$

b$.17\mathrm{.}3$

c$.17\mathrm{.}4$

d$.17\mathrm{.}5$